I have 4" sparkly letters snaking their way around my playroom floor. The kids crawl on them, walk on them, dance on them, play on them. They usually first learn the first letter of their own name, then the first letters of their friends and family members. It's cognitive enhanced by social
During preschool, we do the alphabet in order, but also skip ahead and back throughout the year. We do capital, lower case and sound(s). Adding in learning the letter sounds seemed to make learning the letters easier.
I did a twenty-hour literacy class some years ago, and they told me that my floor alphabet should be in order, left to right, top to bottom, like reading.
So I did that.
And no one played on it anymore
So I made it playful again, and we are back to normal
My one-year-olds typically know a few letters, and it goes from there