I was so excited.

I have just finished an online class  that is the first time in my life. If you asked me，"What did you think of the class，and what was it like?" I would answer, "It was exciting and amazing. The teacher is a very nice and sweet person so it made me relaxing. I had a great time." Keep going !

Need to clarify who "she" is.

I was so excited

I have just finished a class online which was the first time in my life 。If you asked me "what did you think of the class，what was it like" ？It was exciting and amazing 。She was very nice andthey were sweet people so it made me relax 。I had a great time 。keep going !

I was so excited

I have just finished a class online that and it was the first time in my life 。If you asked me ，what did you think of the class ，what was it like ？(I would say)* It was exciting and amazing 。She is very nice and sweet, people so it made me relaxing relaxed 。I had a great time 。keep going !

* The sentence can be understood without the "i would say", but it sounds more proper with it included. Your english is very good! keep practicing!