Thanks, I’ll check those out!
I’ve got another question if that’s okay.
If I’m making a rather large cylinder, in this case it’s a cylinder for a revolver that I’m trying to model, does it matter how many vertices I choose when adding the cylinder?
I chose 20 because it was an even number and I would be able to select 2 faces, leave 2, select another 2, leave 2 etc evenly around the cylinder. because I wanted to make these, not sure what to call them, holes/pockets? Around the cylinder like this.

Can I change the number of vertices later? Can I get it to look smooth and round or is it only when I add it that I can choose this? Because now it’s looking pretty jagged with only 20 vertices.
Sorry this question is really dumb, I really need to read some tutorials as I have no Idea what I’m doing.
Also sorry for my english, I hope you’ll be able to understand what I mean…
Thanks.