Outside English-speaking countries, these are mostly American English or British English that people learn. We compare the two language varieties here.
Some verbs are regular in American English, although they are irregular in British English, and the other way round. In American, some verbs can be both regular and irregular: we include mostly standard shapes, but when a shape prevails in American, we mark it EXT, for extensive.
We mark forms more often to occur in British English as BRE, and those associated with American as AE.
Most dictionaries list irregular verbs alphabetically, so we do not need to repeat that here. We look to speech sound patterns: they make remembering irregular forms much easier. We may begin with just reading a few verbs at a time.
The phonetic script is generalized: phonetics are used world-wide, so it is a good idea to get some practice with them, but the scripts happen to vary in detail. This is why we can stay with a general idea that can help manage in particular contexts.
The free PDF here has the story entire.