@Malwen I don't know really what to recommend you, I have being using it for ages, I have seen in the past good tutorials (text and youtube videos) but probably they are outdated now, like this one:
http://tavmjong.free.fr/INKSCAPE/ .
Of course you have the official documentation. I probably should consult as well tutorials for recent versions, as I know I am not benefiting from all the features it provides.