Cross compiler instructions

**is this the right command to get the cross compiler?

$ dpkg --add-architecture arm64

$ apt-get update**

I already went thru the quick start up guide, so I have WSL already, but doesn’t seem like it have the cross compiler
or should I do this instead:

sudo apt install gcc

link text this link is very vague.

after that I can use gcc to compile?
any article to show me to install, compile and run a hello-world program?

since my question to create a library doesn’t seem to be working,
link text

I thinking maybe I have to do commandline cross compiling
I found this link, but again, I need more detail. is there a better one?
link text