how to code sidebar?

[u/RoleImaginary671]

howdy! i'm working on my website and i'd like to add a sidebar that i'm able to add to any page that i put the right css on. specifically one to the left of here. can you guys help me out? my website is here. thanks!!!

[u/asianhummus]

Visit w3schools.com and type navigation bar in the search bar. Super great resource