I just found this one (thanks for the tip Shiva!), not sure if it's like the oldest tip in the history of mankind or is it something no one knows about, but in any event:
Clicking F4 when you are using MS Office (Excel, word, etc.) will repeat the last operation you did previously.
I'm working at the moment on a PPT presentation and this F4 trick is a savior!
Check it out. (and let me know if you found this useful!)
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