In Spanish there verbs are divided in 3 types according to the last part of their infinitive (1st conjugation "-ar", 2nd conjugation "-er" and 3rd conjugation "-ir)). Most of the verbs follow the same rules rules for the same conjugation and the same person and tense. But we still can find do many exceptions. Most of the kids keep the regular rules and make mistakes (Like "dormo/ duermo de dormir", "rompido / roto de romper", "mordo / muerdo de morder"...).
The best way to learn those verbs is work with a native teacher, watch movies, be part of a immersion program and try to use them. Memorize them takes time and being able to include them in your daily life takes time. We need to practice!
You can do it!