Online tuition takes place via a programme called Zoom. it is very quick and is much more stable than Skype. I use a variety of online whiteboards, including Bitpaper, Openboard and Zoom's own whiteboard. I also use a document camera to demonstrate the use of manipulatives during the lesson. To enable the student to write more easily on the whiteboard, you may wish to use a graphics tablet such as those produced by Wacom or XP-Pen. I am more than happy to give a 15 minute demonstration to parents/students who are thinking about taking up the online option.
Here is an example of a relatively inexpensive XP-Pen Star G430 graphics tablet:
https://www.xp-pen.com/product/46.html