I ignore all the benching advice online, largely. Without a coach in real life, you may just hurt yourself trying to "tuck in the elbows" and all that bull****. There are millions of different shaped shoulders in the world, and not all of us are the same. I actually have much more comfort with a an extra wide grip and elbows flared out, the so-called "dangerous" "bodybuilding" style, and I have MORE shoulder pain, and it feels awkward for me, trying to copy powerlifter style, which sucks for my frame. Although, I do think you should try to keep your shoulder blades pinned back to a certain degree, to stabilize the shoulders, you don't need to worry about it too much.
Just press in a natural manner, for YOU, wide grip, narrow grip, elbows in, elbows out, whatever works for YOU.
Same with dips, I have WIDE clavicles, so I like wide grip benching, wide grip dips, etc. Although my friend at the gym has a smaller frame and he can bench 315 with a VERY close grip, which would ****in kill my shoulders, but for him it works great.
E.g. A short, stocky, barrel-chested power lifter giving bench form advice will be slmost useless for a tall, lanky guy as the upper body mechanics for each guy will be totally different.