I probably should, but I think color cards are beyond my knowledge level at the moment. though when I'm doing coloured art... I'm always finding what's on screen is different to what's in front of me and colour correcting in post... maybe there's something in that.
When it comes to talking head and vlogs, I think colour is pretty loose, as long as you don't look terribly off it's usually fine, but art and photography etc is less forgiving, so maybe something for me to look into.