Please help. Grammar questions.

Is there any warm hearted gentleman and beutiful lady can help me with this?
I would be so appreciated!!!
Thank you!

anyone please~~~

Neither is very natural. You would say :

She still loves fishing even though she has never caught a fish.

a) "even though" introduces a fact, whereas "even if" introduces a hypothetical possibility. Compare :
I'm going out for a long walk, even though it's raining. (the rain is a fact - she knows it's raining at the moment).
I'm going for a long walk tomorrow even if it's raining. (rain tomorrow is just a hypothetical possibility).

b) the verb form : the present perfect is used to express talk about past to present time. Here the concept is: from the time she started fishing up to now. The past simple is used for a specific past time : She went fishing yesterday but she didn't catch anything.

Alternatively you could say :

She still goes fishing even though she never catches anything.

This means you are talking about a "permanent"situation - something you consider to be always true. It has always been like that in the past and you imagine it will continue to be like that in the future.

Sorry - I didn't see the second set of questions when I answered before. These are easy - are you talking about a permanent fact :

Every time my friends and I go fishing, we catch a lot of fish.

or a past event :

I had a fishing holiday with my friends last year and we caught a lot of fish.

Your comment seems to indicate that you mean the first. So :

I often go fishing with my friends. Sometimes we catch a lot of fish. Other times, we don't catch anything.

But if you are talking about the past :

I had a fishing holiday with my friends last year. Sometimes we caught a lot of fish. Other times we didn't catch anything.