What can you read about svg from professionals?

Question

SVG

The bottom line is that it doesn’t reach me how to work normally with svg for a layout designer, because there are a lot of questions, for example, what for a group if positioning is always absolute?
how to set positioning relative to a group?
why does a single element filter run over an element without a filter?

Answer 1

svg-art.ru

Answer 2

https://svgontheweb.com/en/
svgpocketguide.com/book