As a single mom, what's the best way to approach my son about puberty

How old is your son? From my perspective, usually sensitive topics are discussed and spoken with mum. On the whole, i have brought my kids to the library, and gently broached on the topic. So that in wont come out as a shock. It would be more like hey i have heard it before kinda thing. From there slowly start explaining, use books and videos. Do not make fun of them. And keep it as natural as possible. Its natural behaviour and in time they will be curious too. My 3 year old often ask me what are the breast for. So ill just tell and explain it to him and leave it as it is. You will be amazed how quickly they capture things in the little mind of theirs. Cheers