It gives the meaning of continouity. He is learning English. هو بيتعلم انكليزي.

It's a prefix for present tense or present continuous tense, which comes for all pronouns .. Examples : أنا بتعلم عربي I learn Arabic أنا بآكل كُشري دلوقتي I'm eating Koshary now this is used for a dialect, here it's Egyptian Dialect

And Egyptian dialect as well. i think we say it to sound more natural you won't find a native Arabic Egyptian speaker say "هو يتعلم القيادة" he would say "هو بيتعلم السواقة" so it's all about dialect /accent and (ب) at the beginning of the verb do nothing I ain't sure u gonna understand this but i hope it will be helpful

That just due to their dialect, and the same is with the egyptional arabic. يتعلم = بيتعلم They give the same meaning.