Learn to communicate?

How can you learn to communicate?

(this is the situation of a friend)

I've been with my boyfriend for about six months now. We live quite far away from each other, so we talk on the phone often.

Lately there have been more and more conflicts or confrontations about things that bother us and whenever I am in such a situation I am speechless. In these moments I have so much in my head that I want to say, but something stops me. Of course he gets annoyed when I don't respond and the conflict remains unresolved. He simply doesn't see things the way I do. I am annoyed that he doesn't put himself in my shoes or try to understand me, but in the end I am the one who can't explain himself. Even if I have general problems in my life, for example family problems or I am generally sad about something, I am unable to communicate this and keep it to myself.

In my family, it's simply not common to talk about problems, which is clearly evident in my parents' unhappy marriage. As a result, I was never taught how to communicate problems. However, I realize that my family isn't to blame, and it's up to me to change things.

Although I'm making small progress, I'm not making much progress. I'm happy to accept tips or suggestions for improvement because this issue is really bothering me.

Thank you💕