Regular verbs follow a pattern. Just remove the word ending: AR, ER or IR and replace it with a new set of letters based on the person doing the action such as yo, tú, etc.
In this presentation, we used verbs like "hablar", "comer" and "abrir" just as a reference, but this pattern will apply to all regular verbs in that tense.
Irregular verbs don't follow the same pattern so you have to learn them one by one, unfortunately. Try to find patterns within the irregular verbs in order to memorize more verbs.
In this presentation, we added the most common irregular verbs.