But the hard truth is:
Learning math anything takes time and practice…
Could you perfectly speak after you hadn’t any milk bottle in your mouth any more… read after going to school some month… and so on…
The Vector input on the nodes is “simply” just some math…
So you have to understand what a mathematical function is so that you can understand that adding a value to a coordinate aka one value in a vector transforms/ move this coordinate/ point in the vector space (2D or 3D space)… ( ← this are all mathematical terms wich do have a meaning)
An of course just some sentences (or videos) can’t teach you math…
(You know that lineare algebra and analysis are two courses over at least 3 years… ? And you need at least the first.)