How do I resent my fans on my MacBook? It is running really loud and my computer is getting very hot. I have had to do this once before.

Reset the System Management Controller (SMC) on your Mac - https://support.apple.com/HT201295 - Learn when and how to reset the System Management Controller (SMC) on an Intel-based Mac.

If you still have issues after trying @Limnos' suggestion, then run the Apple Diagnostics and EtreCheck. Post the EtreCheck report here using the "Additional Text" icon which looks like a piece of paper.