I made a couple of videos a long time ago, aimed at sharing some knowledge of bombs and trying to promote their more frequent use. I should note that anything relating to shards is now long out of date, but everything else still applies and is aimed primarily at people learning about bombs, so they might be of use.

There's plenty of other videos, threads and guides to go over as well where you'll see intensive discussion on them. The best way is to just read recent posts and ask as many questions as you need; you'll often get several answers in a discussion, giving you varied opinions or details and much to learn from.

Don't be afraid to experiment yourself in game, too~