So basically think of programing as a handyman and programing languages as the tool the handyman uses. Let's say you hire said handyman to redo your bathroom and you walk in to the handyman trying to use a screwdriver to hammer in a nail. You talk to the guy and turns out he only knows how to use a screwdriver and swears it's the best tool for every job. You would, understandably, assume that guy is an idiot who has no idea what he is talking about because that guy doesn't understand the fundamentals of redoing a bathroom. Same thing with programing. Think of languages as tools because different languages have different strengths and weaknesses. Take Java and c++. Java's strength is you basically write the code once and it "runs" everywhere because it's effectively running in a VM. So if you are writing code for a problem that doesn't really care about speed and you really don't know what type of system it is going to be running on Java might be a good option for that problem. But let's say you actually do care about speed and memory management to an extent then you would go with something like c++. C++ let's you manage memory and offers things such as pointers and references so instead of just copying a variable (slow) you can tell the program where to look in memory for that value (fast). But you also have to understand that if you change the value at that memory address it changes the value everywhere, so it's a different beast than Java. C++ also does not run in a VM so you have to compile it on every computer you want to run the program on.

That's why understanding why to use a language and programming fundamentals is more important than learning a language. Fundamentals also transfer between different languages so it helps you learn new languages more quickly as well.