The beauty of the Macintosh Interface is that all your choices are laid out in commands available on Menus. This makes it the most friendly and helpful Interface available on any computer available today.
Many commands also have their keyboard shortcut listed next to them, so that expert Users are not slowed down by the mouse. If they are willing to clutter their brains with the keyboard shortcuts they want to use most often, they can bypass the mouse and move more briskly through program choices.
If you want to know what a program can do, and how to do it, look at the commands shown on the Menus. As Kappy has already said, the ones you seek are likely to be on the Edit Menu. Undo and Redo are top candidates. In some Mac programs, Undo toggles itself into Re-do, so that immediately after Undo, you may move the cursor and Re-do. In other programs these functions may be completely separate, and may be assigned different shortcuts.
Once you have assured yourself what the Commands will do for you, then you can memorize the shortcuts, if you wish.
Only someone in your EXACT situation will already know what the shortcuts are and exactly how that compares to the PC version. Finding that person here is just not very likely.