There would seem to be more ER verbs in common use than the IR verbs and RE verbs put together! We've identified 270 ER verbs but only just over 100 IR verbs and just over 100 RE verbs.
ER verbs are subdivided on the site here by "theme" (personal, household, classroom etc.), but we've taken a different approach for IR verbs and RE verbs, and grouped them by "type of ending" so they're (a) easier to find (b) easier to learn. There really aren't many of each! and the parallels between English and French "word families" are quite striking at times.
Some verbs are "regular", like "vendre"; others are "irregular" and the relevant verb should be linked (individually) to its index-to-tenses. Note that in a "word family", if the central verb like "mettre" is irregular, then other verbs which include the word "mettre" within them may show a similar pattern of irregularities (eg see RE verbs 08).