Visit https://git-scm.com/download/win and follow the install instructions. Open Git Bash. Type git config --global user.name "GITHUB USERNAME" (replace GITHUB USERNAME with your actual username). Type git config --global user.email "[email protected]" (replace with the email you use for github).
Visit https://nodejs.org/en/download/. Choose LTS and Windows Installer.
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Open Git Bash. Make a directory for dev stuff using mkdir dev. Enter the directory using cd dev. Clone the repo: git clone https://github.com/Checkpointapp/Checkpoint. Enter the directory cd Checkpoint.
Enter the node.js directory using cd checkpoint. Type npm ci to install all package dependencies. This will take up to 15 minutes depending on your computer and internet speed. Finally, type npm start. Wait a minute or two and the npm server will open http://localhost:3000 in your browser.
Before making any changes, make sure to pull down the latest remote changes using git pull.
Then type git add . to add all the files you've changed. Type git commit -m "COMMIT MESSAGE" replacing COMMIT MESSAGE with a short description of what you changed. Finally, use git push origin main to push your changes to Github.