Graphics tablets immensely enhance online lessons, particularly from Key Stage Two. As well as using Zoom whiteboards, I have a subscription with Bitpaper and assign a paper to my students from KS2 upwards. Having a graphics tablet means that your child and I can work collaboratively together on documents; just as you would on a whiteboard or paper.
For maths tuition I have found this AMAZING. I can observe a student working a calculation and interject at the point of need. This is something I was never able to do with face to face tuition as it would've been far too disarming and uncomfortable for the tutee and I.
All you need is a basic graphics tablet. Most are plug and go and are relatively inexpensive.