My name is Devon and I am about to tell you about a time I went fishing. I went one day last summer, it was lot of fun.

Original Sentence:
My name is Devon and I’m going to tell you about a time I went fishing. I went fishing one day last summer. It’s a lot of fun to go fishing.

Is my sentence correct.

Your second sentence is a run-on sentence.

My name is Devon and this story is about the time I went fishing. I went last year during summer, it was lot of fun.

This is still a run-on sentence.

"I went last year during summer, it was lot of fun. "

I went last year during summer. It was allot of fun

Right.

However, a lot is two words.

okay

In a few minutes I will send you my final paragraph. If you can help me revise it.

Last summer, my father and I went to the Brahmaputra River. We went to that specific river to go fishing because there is enough fish to feed America. We got are two lucky fishing poles. My father wasn’t very lucky he couldn’t get a single fish on his hook. I caught the biggest fish ever! It was about 3ft long 1ft wide. My father was a bit jealous. He started catching smaller fish each time he tried. When we got home he told my mother the he caught the big fish, but she knew who really caught it

Wrong word>>

We got are two lucky fishing poles.

Run-on>>
My father wasn’t very lucky he couldn’t get a single fish on his hook.

My father wasn’t very lucky, he couldn’t get a single fish on his hook.

We got are lucky fishing poles.

Thank You

Both are still wrong.