Moving from Windows to OSX? There are a bazillion keyboard shortcuts for OSX, but these few took me a while to figure out:

• alt+tab - switch apps
• alt+` (left quote - same key as ~) - switch windows within an app
• command up - same as ctrl+home in windows - jumps to start of document
• command down - same as ctrl+end - end of doc
• command left/right - same as home/end - beginning or end of line
• option left/right - jumps by word left or right