Walls in SLADE 3

Does ANYONE know how tha fuck you're supposed to make Walls in SLADE 3?

If you do, tell me.

Start a new map. Click "Draw lines" button (looks like an arrow pointing at down-right) and draw lines, which will become borders of a new sector. You're supposed to draw a sector, because sectors are essential elements of Doom mapping and the map means nothing without them, even if it has lines.

Oh... KAYYYYYY...

I have no idea how to do any of that. Do you know of a good tutorial for Slade 3?

Here are some to start:

https://github.com/sirjuddington/SLADE/wiki/Tutorials

It's not much, but if you want to see some more, go to Youtube and type "Slade" in the search box. Good luck.

Kthx.