How much screen time should kids aged 5/6 have? Can my Son still learn coding even though I limit screen time?

It's possible to learn coding without using screens at all. There are coding board games, programmable toys, and coding tool kits. I've tried Robot Turtles and Bee Bot with my 5 year old and he took to them quite well. http://www.robotturtles.com/ https://www.bee-bot.us/ https://projectbloks.withgoogle.com/