Son's greatest acheivement of the day

Having put him in school we were greatly worried in teaching him toilet training. I really dont know what to do but it so happened that he learnt it fast and today after going toilet he just came out and took his shorts and pulled it up without me helping him.
But all along he is getting very naughty day by day. He just went to the kitchen took a glass and opened the water can to get water in the glass to drink. Though he opened it he was unable to close it.
OMG he is just 2 years and 8 months. And he is naughty to the core.