Brief
They're all two letter acronyms(that start with p)
Many kinds of puzzles have a high puzzlehunt value, scientifically speaking, so don’t panic if at first glance they seem too hard!
P.?H (high value corresponding to basic in chemistry)(thanks @hugh)
Puzzles can originate from anywhere. My personal favorites come from Pittsburgh puzzlehunts on campus.
P.C?(Petersen Center is the only on campus building at Pittsburgh starting with p, though Pittsburgh might be the P in this answer)
Wondering if 16−−√ should be 4 or −4? Take the puzzlehunt and you’ll find the answer!
P.F (prime factor)
Puzzlehunt helps you learn how to stay fit and take care of yourself.
P.E (physical education)
Puzzles are so important to our lives that even musicians need puzzlehunts to perform properly!
P.?
When forming a team, make sure to have a puzzlehunt, otherwise it’ll be like AD’s team without AD.
P.F (power forward)
Feeling disgusted and want others to know? Simply shout “Puzzlehunt!” and everyone around you will start feeling the same thing.
P.U
Finally, puzzlehunts are great ways to help identify the nuts and bolts in everything, especially when it comes to specific items.
P.L (parts list?)
Final Answer
The second letters seem to be spelling a word but without the blanks I can't get the final answer yet.