How-to: Unity Keyboard and Mouse Shortcuts
There are lots of pages and blog posts popping up describing Unity keyboard and mouse shortcuts, the weightiest being that on Ask Ubuntu.
We'll not re-print the list here, it's one click, go read it.
There's also a thriving industry in cheatsheets, as desktop wallpapers and printable documents, in multiple languages and colour schemes. I like Octavian Damiean's Unity Keyboard and Mouse Shortcuts Wallpaper (Ask Ubuntu again) and the PDF cheat sheet by Brousch.
Search around some more you will find German and Spanish versions and who knows how many more. RC