Bloomberg provides cheat sheets, documents and online manuals directly from the terminal:
DOCS < GO > - Bloomberg documents
EASY < GO > - Tips & Shortcuts
IPCB < GO > - Cheat sheets/Brochures
MANU < GO > - Online manuals
At the cursor prompt at the top of the screen enter your term and hit the HELP key. The HELP key can be used on any screen or menu level.