Early on, there was a lot for me to learn. That’s not to say I’ve learned it all, but I’ve definitely come a long way. There are a lot of rookie mistakes to make, that will depend a lot on you what you read and who your teachers were. For me, I used the word ‘had’ all the time (3rd person stories).
I came to realize it was completely unnecessary. Nine times out of ten, you can remove ‘had’ or ‘have’. Or if not removed, you can replace it with a better word. Often had is used when the verb should be past tense.
He had taken the pills. – He took the pills.
The sun had broken over the horizon. – The sun broke over the horizon.
She had two cars. – She owned two cars.
Of course, I’m not saying you need to open your files right now and remove every instance of the word. YMMV. Do what’s best for you. Just something to think about next time you’re writing.