You don't actually have to know much (or any) Python to get started with Ren'py - while Ren'py is implemented in Python and can allow you to use Python in your projects to do things that Ren'py can't do, you can create a perfectly good visual novel without using any. (Or, at least, nothing past $ variable = value
, which technically is Python.
The only thing I would caution you wrt Googling tutorials is to watch out for the date of the tutorial. Many of them are old, and will teach you techniques that have been superceded by newer approaches. For example, "image buttons" have largely replaced "image maps." So, where possible, look for tutorials that use Ren'py 7, as opposed to 6, or which are later than, say, mid-2018 (which is when 7.0 was released).[/icode]