Definitely Chrome Remote Desktop. Been using for about 4 years now and haven't had any issues. Improvements over the few years since I first started using it have made it even better.

Remote Desktop... Free... aka MSP360 my favorite

Or
https://www.lifewire.com/free-remote-access-software-tools-2625161

*** After my TeamViewer fiasco at being branded a commercial user, I chatted with Kara from "ANYDESK". ANYDESK seems to be a nice alternative and it is free for personal use (https://anydesk.com/en/downloads). I will test their software 1 or 2 times and, if I like it, then I don't mind going the LITE version for $10 a month ** even thought i could use the personal version for free **. I would like to encourage companies that are sensitive to people's needs and are not so greedy and that don't waste my time

Chrome Remote Desktop is free and seems to work OK