To beat fnaf 1 there are alot of different techniques, but i've got my solutions.
Is a bonnie a threat? Can't oustmart that stupid rabbit? We've got you covered,
when bonnie comes to your door or at the camera next to it, he makes big footsteps noises, that way always check on the light when he comes or if you feel that he is gonna come, it also works with chica.
Does chica causes you troubles? Can't nnotice her? Well then try this one out,
chica can go to the kitchen on her way to kill you, BUT, when she actually is on that one, you can ear some pan sounds and other, even if not using the camera at all.
Is foxy too fast? Can you slow him down? Of course you can !
As explained in alot of strategy video, checking foxy can prevent him for comming randomly without you even knowing ! BUT ! There's more to it, if you check foxy once every seconds he wont even show up, but i personnally like the "stalker move", check on foxy every time once every 3 seconds, then wait on your office to not waste your power too much, and if bonnie or chica shows up, check on foxy less then before to minimize the waste of power.
LAST OPPONENT !
FREDDY FAZBEAR !
Freddy is very smart, but there's a way to block him for the whole night, as alot of poeple knows, looking at freddy on the cam blocks him ! But ... We can complete the stalker technique by when you check on foxyswitch to freddy and when you take your camera back again, switch to freddy, then continue like that for the rest of the night and between these moment where you dont have your cam, put the lights on the corridors, might be helpful if you wanna use my special technique, the "stalker move" !
I hope you will finish the 6 nights with this
btw if you try 4/20 with this technique you might never win ...
Thanks for reading