Verbos irregulares (Español)

Hello.. my name is Raphaela and I currently live in Münster.. I'm from the late eighties.. After graduating from high school, I first studied and then did an MTA training in the laboratory.. and as a supplement, further training as a medical typist/ Graduated as an assistant. I learned Spanish myself (with a stay abroad) and after a few years I noticed that I find it difficult to remember the correct forms of irregular verbs, especially the verbs in the presence and indefinido. Only by comparing the present tense, indefinido and subjunctive could I remember the correct verb forms. The book or books are designed to show the Spanish grammar accordingly, so that everything I found difficult to explain in detail again. There are also some tips for learning.