If you learn Slovenian, then you may already know that there are many exceptions in Slovenian and just as many irregular verbs.
Let’s take the verb plesati, to dance, for example. The verb plesati is irregular in the present tense and the imperative. Many students of Slovenian would first think that we conjugate it as jaz plesam, and that it is a regular verb, but that’s not the case. We conjugate it as jaz plešem, I dance, in the 1st person singular, and the 1st person singular defines the conjugation pattern of all the other persons in the present tense and the imperative.
That’s why this verb manual is such a useful tool to help you conjugate Slovenian verbs properly.