In understanding mathematics, consideration of nuances is essential to prevent mistakes from occurring. This is done through meticulous observation when working through questions. Mathematics is not the be-all and end-all of reality, but is an essential component when understanding the language of the universe and questioning originiality.
In understanding coding, I recommend making a list of all the codes you come across alongside their purposes. This simplifies the amount of work you may have to do in the furture recalling them, a problem I find myself in right now as I make this.
When picking up something new, failure is to be expected lol. You are not special, so don't try to rush ahead. Learn everything there is to learn, and be a master so none can replace you. Otherwise, AI will become your substitute or employer.
This is a quote from Katherine Johnson:
We will always have STEM with us. Some things will drop out of the public eye and go away, but there will always be science, engineering, and technology. And there will always, always be mathematics.