Young children do so much learning through free play. It gives them time to learn without boundaries and in their own way and time. That doesn’t mean that any parent-directed academic learning is wrong, but perhaps that it should be done with a gentle hand and a fluid agenda. Don’t feel pressured to have a child perform as this often leads to stealing the joy out of learning!
You can plan the perfect homeschool preschool unit and it will beautifully dovetail with this gentle approach. Better yet, you can do it without spending any money!