Can anyone recommend any good materials for beginners please? Books, videos, wikis... anything. I really want to learn the basics!

I would recommend starting with a Golden Pothos plant. It’s really resilient and rewarding. Grows at a decent pace so you won’t get bored waiting for it to put out new growth. Stick your finger in the soil and if it feels dry water it. Good luck and I think Summer Rayne Oakes and Epic Gardening on youtube have good videos on plant care.