I recently got a Boss GT-1 Guitar effects processor and my question is should I use it in the FX loop or is in the front of an amp fine. My other question is if my effects processor also has an amp modeling function, is getting an amp with a good preamp even worth it, if the FX loop would bypass it? (P.S sorry if I have said any thing dumb or wrong I'm new at this) side note what affordable amps work well with a Boss GT-1?
No, definitely not as a rule, but it's something to try. The best thing is to try both and use what sounds best to you.
It depends on the type of effects that you are using and to some degree personal taste whether it will sound better in the FX loop. Most people tend to want volume based effects like distortion/overdrive in front of the preamp because often the very point is to boost the signal enough to overdrive the amp's preamp naturally. Some people prefer time based effects like delay/chorus/reverb in the FX loop, but definitely try both and see what you like.
Of course, some amps don't even have FX loops so it's not unheard of or unworkable to put everything in front. And given that with a multi-effects unit you can't really put some effects in front and some in the FX loop, I'd probably default to the front.
As for amp modeling, that again depends on if you like the sounds you're getting and if you're sure you that never want to use a natural amp tone. I have a Boss GT-6 and while the amp modeling is ok I guess, I greatly prefer a real amp. But again there's no correct answer.
The GT-1 would normally be used between guitar and amp, i.e. not in an effects loop. Feel free to try other configurations if you wish!