diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 6eaae89..503b01e 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -24,6 +24,7 @@ If yes, please describe the impact and migration path for existing applications:
 
 **The PR fulfills these requirements:**
 
+- [ ] It's submitted to the `dev` branch, **not** the `main` branch
 - [ ] When resolving a specific issue, it's referenced in the PR's title (e.g. `fix #xxx[,#xxx]`, where "xxx" is the issue number)
 
 If adding a **new feature**, the PR's description includes:
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 59cb71d..b653da4 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -19,6 +19,7 @@ on:
       - src/**
       - rspack.config.ts
     branches:
+      - dev
       - main
   schedule:
     - cron: '28 17 * * 5'
diff --git a/.github/workflows/compressed-size.yml b/.github/workflows/compressed-size.yml
index 2b02b6c..d3340d5 100644
--- a/.github/workflows/compressed-size.yml
+++ b/.github/workflows/compressed-size.yml
@@ -11,6 +11,7 @@ on:
       - package.json
       - yarn.lock
     branches:
+      - dev
       - main
 
 concurrency:
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 4a4437c..6b18a00 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -1,6 +1,7 @@
 name: deploy
 
 on:
+  workflow_dispatch:
   push:
     paths:
       - config/**
@@ -11,6 +12,7 @@ on:
       - package.json
       - yarn.lock
     branches:
+      - dev
       - main
 
 jobs:
@@ -24,7 +26,16 @@ jobs:
       - name: Build
         run: yarn build
       - name: Deploy to github pages
+        if: ${{ github.ref == 'refs/heads/dev' }}
         uses: JamesIves/github-pages-deploy-action@v4
         with:
           folder: dist
           branch: gh-pages
+          repository-name: typescript-tutorial-exercises/preview
+      - name: Deploy to github pages
+        if: ${{ github.ref == 'refs/heads/main' }}
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          folder: dist
+          branch: gh-pages
+          repository-name: typescript-tutorial-exercises/typescript-tutorial-exercises.github.io
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 903f563..dbabedc 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -3,6 +3,7 @@ name: lint-code
 on:
   pull_request:
     branches:
+      - dev
       - main
 
 concurrency: