This topic, frame/fork alignment, has been discussed many times before. There's quite a number of threads one can search for. here's one from 2017 where I describe a low cost "home" alignment check.
Bike Pulls to the Left - Bike Forums My post (#16) has photos of what I used to do before I got my surface plate and fork "vise". One doesn't need fancy tooling or expensive jigs to do this stuff. It does help to have a mind that is good at spatial relationships (round hole, round peg) and can be patient enough to let the awareness develop. Andy