jb1412

hi im new to this software and am finding it a little confusing hopefully you can help? firstly when creating a shape on the new layer do i just draw a shape from the tools located on the left hand side and if so i have tried this but it doesnt appear as a black box. do i fill this colour in with the paint tool? also im a little confused with the term invert? could you explain what you mean please also how do you select things for deletion