VS-code is more better if you are starting out and it is light weight.
Install VS-Code from here
If you mean to say you want to enable unity-intellisense, then in your unity editor go under edit > preferences. See the image below.
Select VS-Code as your ide and for generate .csproj files uncheck all and check only registry packages, then hit regenrate .csproj files. It will take time to generate them.
In Vs-Code install the c-sharp extension and reload the window. Then you should be ready to start using it for game developement in unity.
preferences image
c-sharp extension image
But if you want for Visual Studio only install Visual Studio depedencies from unity hub while installing the version
unityhub installation for visual studio
Please check the images and link given too