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diff --git a/src/065-four-spaces-of-typescript-declarations/157-modifying-window.problem.ts b/src/065-four-spaces-of-typescript-declarations/157-modifying-window.problem.ts
diff --git a/src/065-four-spaces-of-typescript-declarations/157-modifying-window.solution.ts b/src/065-four-spaces-of-typescript-declarations/157-modifying-window.solution.ts
diff --git a/src/065-four-spaces-of-typescript-declarations/158-modifying-globalthis.problem.ts b/src/065-four-spaces-of-typescript-declarations/158-modifying-globalthis.problem.ts
diff --git a/src/065-four-spaces-of-typescript-declarations/158-modifying-globalthis.solution.ts b/src/065-four-spaces-of-typescript-declarations/158-modifying-globalthis.solution.ts
diff --git a/src/065-four-spaces-of-typescript-declarations/159-modifying-process-env.problem.ts b/src/065-four-spaces-of-typescript-declarations/159-modifying-process-env.problem.ts
diff --git a/src/065-four-spaces-of-typescript-declarations/159-modifying-process-env.solution.ts b/src/065-four-spaces-of-typescript-declarations/159-modifying-process-env.solution.ts
diff --git a/src/075-designing-your-types/160-domain-modelling-in-typescript.problem.ts b/src/075-designing-your-types/160-domain-modelling-in-typescript.problem.ts
diff --git a/src/075-designing-your-types/160-domain-modelling-in-typescript.solution.ts b/src/075-designing-your-types/160-domain-modelling-in-typescript.solution.ts
diff --git a/src/075-designing-your-types/161-intro-to-helper-types.problem.ts b/src/075-designing-your-types/161-intro-to-helper-types.problem.ts
diff --git a/src/075-designing-your-types/161-intro-to-helper-types.solution.ts b/src/075-designing-your-types/161-intro-to-helper-types.solution.ts
diff --git a/src/075-designing-your-types/162-multiple-type-parameters.problem.ts b/src/075-designing-your-types/162-multiple-type-parameters.problem.ts
diff --git a/src/075-designing-your-types/162-multiple-type-parameters.solution.ts b/src/075-designing-your-types/162-multiple-type-parameters.solution.ts
diff --git a/src/075-designing-your-types/163-default-type-parameters.problem.ts b/src/075-designing-your-types/163-default-type-parameters.problem.ts
diff --git a/src/075-designing-your-types/163-default-type-parameters.solution.ts b/src/075-designing-your-types/163-default-type-parameters.solution.ts
diff --git a/src/075-designing-your-types/164-type-helper-constraints.problem.ts b/src/075-designing-your-types/164-type-helper-constraints.problem.ts
diff --git a/src/075-designing-your-types/164-type-helper-constraints.solution.ts b/src/075-designing-your-types/164-type-helper-constraints.solution.ts
diff --git a/src/075-designing-your-types/165-tighter-version-of-omit.problem.ts b/src/075-designing-your-types/165-tighter-version-of-omit.problem.ts
diff --git a/src/075-designing-your-types/165-tighter-version-of-omit.solution.ts b/src/075-designing-your-types/165-tighter-version-of-omit.solution.ts
diff --git a/src/075-designing-your-types/166-template-literal-types.problem.ts b/src/075-designing-your-types/166-template-literal-types.problem.ts
diff --git a/src/075-designing-your-types/166-template-literal-types.solution.ts b/src/075-designing-your-types/166-template-literal-types.solution.ts
diff --git a/src/075-designing-your-types/167-passing-unions-to-template-literal-types.problem.ts b/src/075-designing-your-types/167-passing-unions-to-template-literal-types.problem.ts
diff --git a/src/075-designing-your-types/167-passing-unions-to-template-literal-types.solution.ts b/src/075-designing-your-types/167-passing-unions-to-template-literal-types.solution.ts
diff --git a/src/075-designing-your-types/plan.md b/src/075-designing-your-types/plan.md
@@ -3,3 +3,24 @@
 Title here!
 
 ## Exercises
+
+- Modeling your domain in TypeScript
+  - Defining types that represent the concepts and entities of the problem domain
+    - Users, Products, Orders, etc.
+  - Modeling early helps keep code maintainable
+- Helper types
+  - Types that are defined using other types that help you manipulate, transform, or constrain existing types
+  - Type arguments in types
+    - The parameters you pass to a generic type
+    - Can be any valid type expression
+    - e.g. `Array<string>` is a type that takes a type argument `string` and represents an array of strings
+    - Type variables, constraints, defaults, and inference make type arguments more flexible and expressive
+  - Composing types into other types
+    - Use unions and intersections
+      - `User & Admin`
+    - Template literals for strings
+      - Create string types based on template literals which can contain placeholders, expressions, and modifiers
+      - e.g. a string type representing a valid email address with `@` and `.` as placeholders
+        - `type Email = `${string}@${string}.${string}`;`
+  - Create your own with generics, keyof, typeof, indexed access, conditional types, and mapped types
+    - Example of a helper type that makes all properties of a type optional except for a few specified ones
diff --git a/src/080-configuring-typescript/168-introduction-to-tsconfig.problem.ts b/src/080-configuring-typescript/168-introduction-to-tsconfig.problem.ts
diff --git a/src/080-configuring-typescript/168-introduction-to-tsconfig.solution.ts b/src/080-configuring-typescript/168-introduction-to-tsconfig.solution.ts
diff --git a/src/080-configuring-typescript/169-tsconfig-bases.problem.ts b/src/080-configuring-typescript/169-tsconfig-bases.problem.ts
diff --git a/src/080-configuring-typescript/169-tsconfig-bases.solution.ts b/src/080-configuring-typescript/169-tsconfig-bases.solution.ts
diff --git a/src/080-configuring-typescript/170-multiple-tsconfig-json-files.problem.ts b/src/080-configuring-typescript/170-multiple-tsconfig-json-files.problem.ts
diff --git a/src/080-configuring-typescript/170-multiple-tsconfig-json-files.solution.ts b/src/080-configuring-typescript/170-multiple-tsconfig-json-files.solution.ts
diff --git a/src/080-configuring-typescript/171-extending-from-other-tsconfig-json-files.problem.ts b/src/080-configuring-typescript/171-extending-from-other-tsconfig-json-files.problem.ts
diff --git a/src/080-configuring-typescript/171-extending-from-other-tsconfig-json-files.solution.ts b/src/080-configuring-typescript/171-extending-from-other-tsconfig-json-files.solution.ts
diff --git a/src/080-configuring-typescript/172-project-references.problem.ts b/src/080-configuring-typescript/172-project-references.problem.ts
diff --git a/src/080-configuring-typescript/172-project-references.solution.ts b/src/080-configuring-typescript/172-project-references.solution.ts
diff --git a/src/080-configuring-typescript/173-jsx.problem.ts b/src/080-configuring-typescript/173-jsx.problem.ts
diff --git a/src/080-configuring-typescript/173-jsx.solution.ts b/src/080-configuring-typescript/173-jsx.solution.ts
diff --git a/src/080-configuring-typescript/174-rules-that-make-up-strict-mode.problem.ts b/src/080-configuring-typescript/174-rules-that-make-up-strict-mode.problem.ts
diff --git a/src/080-configuring-typescript/174-rules-that-make-up-strict-mode.solution.ts b/src/080-configuring-typescript/174-rules-that-make-up-strict-mode.solution.ts
diff --git a/src/080-configuring-typescript/175-no-unchecked-indexed-access.problem.ts b/src/080-configuring-typescript/175-no-unchecked-indexed-access.problem.ts
diff --git a/src/080-configuring-typescript/175-no-unchecked-indexed-access.solution.ts b/src/080-configuring-typescript/175-no-unchecked-indexed-access.solution.ts
diff --git a/...080-configuring-typescript/176-creating-declaration-files-and-declaration-maps.problem.ts b/...080-configuring-typescript/176-creating-declaration-files-and-declaration-maps.problem.ts
diff --git a/...80-configuring-typescript/176-creating-declaration-files-and-declaration-maps.solution.ts b/...80-configuring-typescript/176-creating-declaration-files-and-declaration-maps.solution.ts
diff --git a/src/080-configuring-typescript/plan.md b/src/080-configuring-typescript/plan.md
@@ -3,3 +3,17 @@
 Title here!
 
 ## Exercises
+
+- `tsconfig.json`
+  - The file that contains compiler options and the files or folders to compile
+  - Nesting `tsconfig.json` inside subfolders
+    - Multiple `tsconfig.json` files can be in different subfolders of the project, and each will be treated as a separate project
+  - The `extends` property can be used to inherit configuration from another `tsconfig.json` and override or add options.
+- My recommended `tsconfig.json`
+- Commonly used `tsconfig.json` attributes:
+  - `jsx`
+  - `strict`
+    - `noImplicitAny`, `strictNullChecks`, `strictFunctionTypes`, etc.
+  - `noUncheckedIndexedAccess`
+  - `moduleResolution`
+  - `declaration` and `declarationMap`