English puts -ing after a preposition: thanks for coming. Spanish uses the plain "to" form. Resist the -ing temptation, which is pure negative language transfer.
Gracias por venir. (thanks for coming)
Gracias por llamar · Gracias por llamarme · Estoy cansado de trabajar · Es una forma de hacerlo · No creo en discutir
Por is far more flexible than para. Two more uses here: because of, and exchanging one thing for another.
He venido por ti · Es por ti que hemos venido · Cambiaría este por ese · Cambiaría estos por esos · ¿Cambiarías estas por esas?
Whenever you want because of, avoid the temptation to translate it as "porque de".
Because estar already carries the sense of location and state, you often need no word for there or here at all.
¿Estás? (are you there?) · ¿Está Juan? (is Juan there?) · Estoy para ti
Knocking on a door or messaging online, ¿Estás? on its own does the job.
The Latin-English vocabulary is mostly very reliable, but a few words look the same and mean something different. Watch for them.
Discutir carries a heavy connotation: it is what you do with your partner in an argument. For discuss, use hablar. And mi trabajo actual is my current job.
No creo · De esta forma · No creo en discutir de esta forma
Asked to redo a question, the student rattles off the wrong person. The instruction is blunt: we do not want to stop thinking.
Estaba cansada de trabajar · Estábamos cansados de trabajar
One practical note: online you may see por written as x, since por is also the times of multiplication (ocho por ocho). So gracias por venir can appear as "gracias x venir", which is confusing if you use x for kisses.