My first said her first words at 9 months old, "ba" for ball, bath, and 2-3 more meanings, and made a repeated sound pointing towards the object of interest, sound which cannot be described in words. Before the age of 1 we had amassed over 50 words, most up to 3 syllables, a handful had more. Same for walking, fine motricity, etc. She reads at 5 years old.
My second only started saying single syllable words at 1y10m, started walking similarly later, and isn't able to do at 1y10m most things that my first was already able to do before being 1yo, so the delay between them is higher than 100%, more than double.
Same family, same teaching style, etc, only 3 years apart.
The ability to teach your child to do something depends almost entirely on the child, your teaching abilities don't seem to matter much, they simply copy you. All that matters is that you are present and offer them the attention they need.