How to learn SP syntax (PHP, JS)?

Question

IT education

I’ve been working as a full-stack developer for a year and a half, but I’m not able to write complex algorithms, functions myself, I google it and follow the example. How to learn the syntax of any PL (PHP, JS, etc.) so that you do not climb and google how to write this or that cycle? like while...do, if else etc?
The question is exactly how to remember the syntax of the PL, and not the logic of the algorithm, because I understand this