I think the two big things I have to add are:

1. Don't let the church educate your son on these things.

2. Don't say nothing.

If you're unsure about talking to them about these things yourself, seek out a man you trust, talk to them about it and make sure your values align, and then talk to your son about them together.

Lots of great replies, just want to add that if he's uncircumcised and you haven't covered the topic yet; washing under the foreskin is important hygiene. Same with washing his ass while we're on the topic of hygiene.

Vocally theres gonna be cracks as it deepens. It sucks, nothing to be done.

There will be at least one wet dream if not more, Hydrogen peroxide soak, then wash with OxiClean should rock those stains as both are recommended for 'protein'. Wash cold.

Erections at random times will 100% happen. It's expected.

Acne will happen, body is a wreck of hormones. Use a new pillowcase nightly, do skincare, should largely be fine. If it gets wild prescription stuff might be needed.

Thats all the big puberty stuff really, short of whether the quarterback or head cheerleader makes his pp into the big pp but thats a whole other discussion.

There is a wealth of resources regarding sexuality and thematics for adolescents in general available here: https://www.youmo.se/en/

also, Big Mough comes recommended by the city of reykjavik, which has lots of stuff regarding sexuality and gender issues, but not all in english.

i want to emphasise training how to use a condom, finding out the correct size is something that's on his to do list. Proper hygiene is also learned (my parents didn't give a shit and it caused me problems far longer than necessary) - tell him if he needs to shower, body odor changes fast during puberty, and it's easy to be nose-blind to your own smell.

I saw someone recommend giving a gift card for a sex toy - i think that's a good idea, the sex drive in puberty was constant and to be honest at times annoying and distracting,

Besides all the stuff related to sex that many people have already written down here:

1. That it is normal to have overwhelming emotions at this age. It's fine if he gets angry, or sad or whatever. Find an outlet for that emotion.

2. He is gonna get a long stronger. It is important to approach this with sensibility: saying stuff like "strong men are dangerous" or "men are strong and women are weak" etc can actively harm young men's mental health. I'm sure there are good resources for this online as well, though I'm not sure where. He needs to realize that he will need to control how much force he puts into things much more than as a child, but at the same time that people are not afraid of him and should not be.

There are books for that, that usually take all the important bits and put them in funny, engaging ways. It could be a nice thing to get, even read together.

My parents didn't really give me a talk, where I live we have pretty comprehensive sex education in school that starts at 8/9 and finishes around 14/15.

At 13, maybe he's already been given some kind of education about his body (especially since he already shaves and has already probably had wet dreams and discovered masturbation). Do you know what he already knows?

Family isn't going to work for you, but do you have male friends or work colleagues you trust enough to ask for advice?

By the time you are 14, you have probably figured out everything about yourself. Tell him what girls want and think at his age. When i was a kid, my friend was dead convinced that all girls prefer anal sex, cause "that doesn't hurt". He based that, I assume, entirely on porn he had seen.

If he suddenly really wants to do his laundry one morning, don't ask questions. (Wet dreams and embarassment being the context here.)

That's about all I can think of that's gendered, really.

I was ~9 when I got the talk from my Dad, and it was basic stuff about just the mechanics. It set things up so that, around 13, I went to him with questions about how I was feeling re: puberty. So even now it'll be helpful to do the talk and show that you're available as a resource.

In your case, your son likely has some idea from internet pornography and whatever he got in school, but it would still be helpful to go through the basics with him. I'd frame it as "I'm sure you know most of this, but i just want to make sure you know what's important." It might also be helpful to make clear that pornography is as much acting as TV is - don't set his expectations on it, it's people faking things for money.

Going over the importance of condom use also helpful at his age. Keep in mind, it's not necessarily about what he's going to use right away, but making sure he knows when he does need to know.

Then, I'd just be there for him and ask if he has any questions, and answer them frankly. Tell him he can come back later if he's unsure.

It's awkward and tough I'm sure, but it'll be a help not just now, but going forward. Good luck!

For real, go to a library and ask a librarian for help.

They'll have various books aimed at different levels of maturity and reading levels. Get a book, read it yourself, then ask him to read it and talk about what you learned.

As a father, I didn’t even know what to do or expect, we’re all messy, gross, and dumb at that age. The path I chose, was if they knew enough to ask a question, it was time for a discussion. Just pay attention, offer a safe environment for questions and be honest. Most of what they need to learn the world with teach them. Be there to fact check and maybe even learn together. Last tip… WE made biology gross and taboo, WE can make it less so for our kids.

John and Hank Green's CrashCoarse is about to release a new sex ed series. I watched their whole computers series and thought it was fantastic.

First things first, I'd suggest looking into Big Brothers, Big Sisters if you're in America. I've been a part of their program and it's a great organization dedicated to helping kids exactly like this

OK, onto real advice: it sounds like you're a woman and one of the things you need to address early with young men is respect. He will become significantly stronger than you very soon. He will have a ton of hormones pumping through his body. He is going to become dangerous to himself and others. He will be curious about how strong he is. You have to make sure he explores that safety. This is something all men go through and it's important to have a good foundation or he can start spiraling down bad paths. You need to police his internet usage, his friends, and his role models or he could very easily start sliding into anti-women and abusive views

If he's not enrolled in any sort of physical activity I would encourage you to find one. He's going to have basically unlimited energy and channeling that into sports is usually better than the alternatives. That's also tricky because you need to pay attention to the leadership of those activities to ensure that they are good influences

Now the fun stuff: he is going to be hungry for the next 5 years. If you haven't grown up with boys it's hard to understand but he can eat 6000 calories in a day and barely notice. My family used to order 2 pizzas when I was a teen, I would eat an entire one and they would eat the other. I'm not exaggerating when I say my average food in a day was a full continental breakfast, 2 deli sandwiches, chips, a dessert and a soda for lunch, an after school snack (usually leftovers), a large dinner, and dessert. I'm not a fat guy, nor was I in school. You will likely think at some point "he can't possibly be eating that much food" and I assure you that he can

Ultimately what is important is that you have to build a good moral foundation for him. You will lose the ability to control him and when that happens all of the work you've done raising him will reflect in the way he acts