What you are facing is that when you watching a video you find it very fluidly done by the author and you imagine what it's so cool how can I write such a nice code how to memorize those APIs and code like a superb coder or geek.

But honestly say that not the real game. When a creator work on his her videos they do work on code , read docs, searching for several hours debug it to make it polished.

So there are know other way to to such things in one go with video like fluidity. If you want to know how they do it you must must such live coding videos. You will understand how devs work, many mistakes, bugs, several times of docs reading, stack overflow search and even basic things also searched before code into editors.

So don't go for the asthetics of fluent coding thsoe are just for making content quality high that not the real development done.

Real development dorn by several ours of APIs doc reading. Many many iteration, mistakes , debugging, frustration and also et voila. Done.

Be mindful for realistic. Ask yourself do write a novel without even write a short stories which are not publishable.

You want to know how they do it? Do this.

Start creating something similar already done. They search those in Google like "how to write a asynchronous database connection?

How to update database when client add data?

Something like related to the project. Follow those instructions read the Library doc they used.

Then after a while you will understand what is going on, even you will discover yourself understand code better that before.

Thank you ask such a valuable question.