Good things can come from bad decisions, and bad things can come from good decisions.
The existential questions come up regardless. Either way you ask yourself why, what's the point, if you matter, if anything matters. And the answer is always no reason and something extremely important, there is no point and the point is because someone cares, you and everything matters but also not at all and certainly not to the universe.
And that's ok.
https://pcpartpicker.com/
Right up until the day they're bought out by shitheads, that's the place to go for setting up a home build.
It verifies compatibility to a level you'd never even think of, including heatsink and graphics card dimensions.