I'd like to learn

[Vipershark]

Don't use 7Paint, it's absolute crap. Switch to the one I just sent you.

Basically you shouldn't use the tools for several reasons. One, they sorta go against the spirit of laying pixels individually (the line tool can be acceptable in some cases where necessary but only the line tool), but mostly it's because the tools are a lot less accurate than you would be had you laid the pixels by hand. For example, the curve tool leaves lots of jaggies and the circle tool makes really ugly circles most of the time. It's generally easier and faster to just do it right the first time instead of getting a tool to do it for you.