He is too young to be navigating the internet.
There is nothing wrong with educational games he can play. When my daughter was little she used the Jumpstart series of games for toddler, preschool and up to 4th grade including Spanish. I loved that series and she loved them as well.
She started playing them around 3. They were educational, they included reading, math, interactive play, etc. There are lots of games on the market that would be suitable for him to play.
In K, the students read the story of the week online and have online activities pertaining to the story. They also start Paws in Typing Town which teaches them keyboarding. By 2nd grade they learn how to do research on the school computers which are protected from some unknown site popping up.
The main thing is to let him play and explore and not be surfing the web. Also don't push him to do something, let him figure out what he likes.
Best wishes.