General:
* Best of all
* Best of luck
* Best of the best
* Best part is...
* Best yet
* Best thing ever
* Best I've ever seen
* Best we can do
* Best we can hope for
* Best laid plans
Related to people:
* Best friend
* Best man
* Best wishes
* Best interests
* Best friend forever
* Best kept secret
Related to things:
* Best seller
* Best option
* Best practice
* Best guess
* Best effort
* Best shot
* Best case scenario
* Best fit
* Best thing since sliced bread
Related to actions:
* Best to
* Best to avoid
* Best to go with the flow
* Best to keep it under wraps
* Best to plan ahead
* Best to wait and see
More creative:
* Best of times
* Best-loved
* Best foot forward
* Best thing to happen
* Best kept secret
* Best of the bunch
* Best in show
This list is not exhaustive, but it provides a good starting point. You can use these phrases to describe a variety of things, from people and objects to situations and feelings.
You can also modify the phrases to make them more specific to your needs. For example, instead of saying "Best of luck," you could say "Best of luck on your exam."
It's important to note that the meaning of a phrase can change depending on the context. So be sure to think about the specific situation when you use a phrase starting with "best."