Need help with extracting downloads

On gmod I cant seem to download anything, Im not sure where to extract the files either, any ideas?

Depends on what the file is.
For downloading off Garrymod.org, ect, you’ll right-click the folder, and hit “Extract All/To”
and select a destiniation with the folder name, like
“C:/Users/Bob/Desktop/Downloads/Addon1”
and go into the file. If you see “Info.txt”, go back out of that folder, and drop it into
“C:/Program Files (or x86 if you’re like me)/Steam/Steamapps/*****/Garrysmod/Garrysmod/Addons”
Replace ***** with your steam username.

If there IS NOT AN INFO.TXT, DRAG AND DROP ALL FOLDERS WITH NAMES LIKE MATERIALS, LUA, ECT INTO GARRYSMOD/GARRYSMOD. IF IT ASKS TO OVER-WRITE, DO YES.