I've always wanted to ask

Seke is a guy who can be both seme and uke and
Bara is yaoi made by men, for man and the characters are usually more exaggerated masculine physiques and stereotypically masculine behavior
Though I'm not really sure about this last one <3

Bara is short for "Barazoku" and is usually a type of art-style of gay males drawn by males. It tends to have more exaggerated, overtly masculine physiques and stereotypically masculine behavior.

Seke is a mix between "seme" (dominant/top) and "uke" (submissive/bottom)

Feel free to correct me if I'm wrong in any areas, I'm not 100% sure.

Thanks for the info (▰˘◡˘▰)