What's the problem with moving the f pawn?

I've always been told to not move the f pawn by people better than me. I tried not to, but I mostly do it anyways, and nothing bad happens. This is complicating. What bad happens if move The f pawn?

In the opening, do not move the f pawn.  But every rule has exception.  Why do no move the f pawn.....because it will suddenly give a chance to your opponent to do tactics on you.  If you dont believe me, try playing with a player rating higher thans your (preferably 300 points higher).  You can play in live (unrated) & find out yourself too

Moving the F pawn in the opening isn't necessarily bad. It just has to be done correctly or it'll be lights out. The problem is that moving the F pawn exposes the king to checks along the H file with the opponent's queen. If the G pawn is moved, it's immediate mate with Qh4# for example. There are openings, many good ones that involve using the F pawn. The King's gambit (Not played at Gm level really but perfectly viable here) and the Four pawns attack. Both are solid openings. 

Anyway, the simple answer to your question is, it exposes your king to the diagonal check on the H file from your opponent's queen. If you do move the F pawn, ensure you develop your kingside knight right after to avoid that check. 

I mostly move the f pawn after casiling (how do u spell that). Is there any dangers to moving your f pawn after casiling.

It still has risks when moving the F pawn after castling but it can be defended properly and is often a good way to play. Just make sure the queen cannot check your king and fork anything or that your pieces aren't hanging out in the open. 

The first diagram I showed isn't showing up so I will do one more. 

or dutch

https://www.chess.com/livechess/game?id=2209785299

The King's Gambit isn't played at the master level because it's busted. The best white can do is draw with 3. Be2 if the gambit is accepted, any other move supposedly loses by force. I haven't went over all of the analysis myself but this seems to be the concensus

Moving the f-pawn after castling is usually safer than before castling. However you can still run into some dangers on the a7 - g1 diagonal if you are not careful, as your king will be more exposed on this line

Good players will often just play Kh1 when there's nothing better to do to safeguard against these potential issues. 

Oh, I thought you were going to talk about effing pawns in general. Do you ever feel like they just get in the way sometimes? What you're really talking about here is f7, which seems to keep popping up all over the place.

Move the f pawn until people demonstrate what is wrong with it.

It can set up a checkmate with a few moves easily for your opponent and could possibly limit your knight.

moving the f-pawn early on weakens your king, especially if you commit to kingside castling.

If you move the f-pawn, a double push g-pawn is a scholar's mate opening.

no, thats fool's mate