Download Microsoft Visual Studio Code at https://code.visualstudio.com/ and follow instructions at https://code.visualstudio.com/docs/languages/go to setup Go extension for it.
Create new directory .vscode in Gitea root folder and copy contents of folder contrib/ide/vscode to it. You can now use Ctrl+Shift+B to build gitea executable and F5 to run it in debug mode.
Supported on Debian, Ubuntu, Red Hat, Fedora, SUSE Linux, MacOS and Microsoft Windows.