Off the top of my head, you can use 1. the modal verb "will" before a verb in the infinitive without "to" 2. "am/is/are going" before a verb in the infinitive with "to" 3. the present or present continuous tense, often with a modifier to show that it will happen in the future: 1. I *will* visit my dad tomorrow. We *will* have an argument, I'm sure. 2. I *am going* to eat the entire cake once it has finished baking. I *am going* to regret it, but that *is not going* to stop me. 3. I *am taking* the kids to the lake Sunday, but first we *are having* a giant junk food breakfast. There are others (e.g. future perfect: "I will have eaten all the cake before they arrive"). Check Chris's link for more detail.

tu puedes decir: Voy a (I am going to) + verbo infinitivo Vas a (you are going to) + verbo infinitivo va a (he/she is going to) + verbo infinitivo vamos a (we are going to) + verbo infinitivo van a (they are going to) + verbo infinitivo por ejemplo quieres decir "Voy a comer" en Ingles puedes decir: I am going to eat.

There are many ways to express an action in the future. https://www.ef.com/ca/english-resources/english-grammar/future/