This means, it's okay to use LLM to try something new that you're on the fence about. Learn it and then once you've learned that concept or the idea, you can go ahead to use same code if it's good enough.

Learn to do it everyday. Learn to do it fast. You'll reap rewards. For example, like identifying root causes and implementing solutions for it.

Try to find answer using top-down questioning. Perhaps ask questions to the party that gave you this feedback (Ask yourself first), Was I too slow? Did I miss out on an important context? What other specific thing was noticed?

For simple, lightweight, fast organisation, I'd recommend maintaining a single file as a todo list.

A file per project. This can be markdown (todo.md) with checkboxes or just a simple todo.txt

This helps you add/edit stuff to the list rather quickly.

This is no answer. Just do things.

On the flip side, try reading books.

Moreover, summarize each chapter in your own words to truly "lock in".

if err != nil { return err }