Walykum assalam
This is mashaAllah a useful thread that many Muslims need to learn about.
At first, this age is a bit too early for you to start teaching your child subjects like English, Maths etc. But you can always teach them numbers and alphabet reading and writing.
It is an age where you should do a lot of read aloud to your kids especially islamic stories. You will find plenty of them in the Islamic bookstores.
Also it is a good age where you can start encouraging your child to memories short surahs of the Quran by letting your child listen to a surah over and over in the car or at home and they will subconsciously repeat till they memorize.