When did muhhamad began to teach people about islam?

around 610 ce(40 years old)

he started meeting the angel jibreel and started preaching secretly to family and friends 613 was when he went publicly in his tribe

however when he started preaching completely publicly like in cities and far away tribes was in 622

it may be touching on the issue of over sexualizing all women

d)to gain support for the independence movement.

hope this : )