Learn Python

[FurFles-]

Hello, I'm new to Ren'py

I want to make a visual novel with unique systems created by me

If I know Python will it be simpler?

[zankizuna]

It is definitely a plus.
You can add whatever features are compatible from Python libraries by using "import" under "python:" or "init python" statements.

If it's something as easy as displaying buttons, or customized menus, animating, or importing videos, the Ren'py language has those covered.
You can tell us what kind of system you want to do, and the forum may be able to help.

[Autumnotopia]

Knowing a little bit of programming will always make videogame dev easier, even in something (relatively) simple like Renpy. I recommend this Python tutorial, it's really easy to follow and has inline code testing stuff.