Focus on where you want the bike to go. If you focus on the thing you're trying to avoid, you'll probably hit it.
Avoid any metal drain covers - they're slippery.
If you don't know a particular corner, slow down before you start leaning over, then apply the gas progressively when you can see where the road goes.
Slow in, fast out is better than fast in, panic brake, slide off!
If it's rained recently but the road has dried, there will still be damp patches in areas shaded from the sun (invariably on a bend), so be prepared.
As others have said, getting your knee down on an old CB will usually be followed by your elbow, head, etc., so forget it.
Whatever manoeuvre you're doing (especially overtaking) always make sure you have a Plan B (potential escape route) if anything goes wrong.
Assume that every other road user is an idiot whose prime intention is to kill you, because that's how most of them drive.
Take it easy until your confidence has grown and you've got more miles under your belt.
Good luck!
