Before scrolling down, while it is SPOILER FREE it will state how many bosses are there, so please keep that in mind.

Resident Evil 7 SPOILER FREE tips
Fight with mia winters in the attic is not needed for a hint guide. so we will skip her
#1 Jack (garage)
This fight can be a bit hard to understand what to do, no simply shooting him will not work. Your best bet is to really keep your eyes open for any items around you. search hard and you may find something that will provide a good clue what to do next, the item you find, should make things obvious.
Spoiler guide:
#2 Jack (morgue)
This is one cool fight for sure, Keep your distance starting out, and use the bodys to aid you in keeping him Back. There is an item your going to need, and to get it, simply play out the battle like any other enamy. at a point jack may get angry, and open a doorway of enlightenment for you.
Spoiler guide
#3 Marguerite (spider)
Theres not many hints to give, have alot of ammo going into this fight, especially fire.
Spoiler guide
#4 Jack (pier)
Yah i know, hes huge. But don't let him intimidate you, think for a sec, hes actually pretty easy. "eye for an eye" and dont be afraid to go down bottom, its easier on his level.
Spoiler guide
#5 Final Boss
No hints to provide here, should be a no brainer, very easy fight.
Spoiler guide
I hope these tips help you.