Log into Netlify (remember that you sign in using GitHub)
On your Netlify dashboard, click "Sites" in the left navigation
Click on the "Add new site" button, then "Import an existing project"
This might be familiar now! Click "GitHub" as your Git provider
A pop up will show briefly, but then you'll see a list of your GitHub repos. Click on the relevant one
Under "Branch to deploy" choose the "main" branch of your repo, which is usually called main. You do not need to change anything under "Customize build settings", Netlify will do this for you
Set your settings to build the site. By default it will be build command npm run build and publish directory build. After that, Click the "Deploy site" button.
It may take a few minutes before the deploy is complete.
Once the site is deployed, a pop up will appear saying that the deploy was sucessful. Click on View site deploy.