Ichidan verbs are the easier of the two main verb conjugation groups, since all you have to do to find the stem is just remove the る.
and so on
Godan verbs have the same endings as ichidan verbs. (with the caveat that sometimes they become voiced, so a た changes to だ in certain words in a predictable pattern) However to find the stem, you must change the final sound of the dictionary form, so it’s a bit trickier.
I know sometimes these are called る verbs and う verbs, but not all verbs that end in る are ichidan so be careful about that. If a verb doesn’t end in る, you’ll know it’s godan. If it does end in る, the best thing to do is look it up. You can also determine which group it’s in if you hear it / see it conjugated, once you get more used to it. Not sure if that’s the info you were looking for but hopefully it’s helpful. ^^;