面白くて

interesting, fun

→ 面白い
面白 interesting, fun + Adverbial/continuative form of an i-adjective + Te-form (conjunctive)
adjective Rare #28,392
interesting, fun The て-form of 面白い, used to connect this adjective to what follows.
JA: この本は面白くて、一気に読んだ。
EN: This book was so interesting that I read it all at once.
Forms of 面白い

映画はすごく面白くて最後まで釘付けでした

The movie was so captivating that I was glued to the screen until the very end.

結構面白くて結構笑った

It was pretty funny, and I laughed quite a bit.

この本は面白くてためになる

This book is interesting and educational.

手品ショーどんなに面白くて僕はたいして好きではない

No matter how entertaining a magic show is, I don't really like it.

外国語を習うことが本当に面白くて楽しいよ

Learning foreign languages is really interesting and fun.