Yes the IT world is complicated and a wide field, with sub disciplines and (like any other field) it’s own jargon.
Many terms are pure marketing without substance or even misused by marketers. There has been to many hypes in this branch. I don’t like that.
On the other side there are terms that are fine. I like the terms program and software but they are no synonyms. Software can be a program but not every program is software. And applications are programs that serve some function to the user and not to other software.
To get to your question: I don’t think you will have to learn to much if you use the L5 similar to an android, but every system has it’s differences to others. And that’s why I think you might see some new stuff. This depends on what your Linux expertise is. And also some of the people here will do crazy things with the L5 that could hardly be done with an android not even to say iPhone.