regular ar endings
regular er endings
regular ir endings
The accent marks on the vosotrxs forms are short-hand for the fact that the word would be stressed on that syllable. If it's a single-syllable word, it may not actually have the accent mark. The only way it would then is if it has to be distinguished from a homonym that doesn't get sentence-level stress.
There's also stem changes. Possible stem changes are
e -> i
e -> ie
i -> ie (very rare)
o -> ue (if the ue is at the beginning of the word, you have to put an h before it)
u -> ue (very rare)
ie would also have to have an h before it at the beginning of the word, but I think all such words already have an h at the beginning of them in the infinitive.
stem changes appear in the boot or short-boot. Boot is yo, tú, ella, ellas. Short-boot is all those except yo. If the stem-change only appears in the short-boot, it's because the yo form is irregular.
Then there's some other weird irregular forms that you have to memorize. meh, not gonna go into all that.
There are six verbs where the yo form doesn't end in an o. Only six.