I am beginning to suspect that it is surprisingly common for intelligent, competent adults to somehow make it through the world for a few decades while missing some ordinary skill, like mailing a physical letter, folding a fitted sheet, depositing a check, or reading a bus schedule. Since these tasks are often presented atomically - or, worse, embedded implicitly into other instructions - and it is often possible to get around the need for them, this ignorance is not self-correcting. One can Google "how to deposit a check" and similar phrases, but the sorts of instructions that crop up are often misleading, rely on entangled and potentially similarly-deficient knowledge to be understandable, or are not so much instructions as they are tips and tricks and warnings for people who already know the basic procedure. Asking other people is more effective because they can respond to requests for clarification (and physically pointing at stuff is useful too), but embarrassing, since lacking these skills as an adult is stigmatized. (They are rarely even considered skills by people who have had them for a while.)
This seems like a bad situation. And - if I am correct and gaps like these are common - then it is something of a collective action problem to handle gap-filling without undue social drama. Supposedly, we're good at collective action problems, us rationalists, right? So I propose a thread for the purpose here, with the stipulation that all replies to gap announcements are to be constructive attempts at conveying the relevant procedural knowledge. No asking "how did you manage to be X years old without knowing that?" - if the gap-haver wishes to volunteer the information, that is fine, but asking is to be considered poor form.
(And yes, I have one. It's this: how in the world do people go about the supposedly atomic action of investing in the stock market? Here I am, sitting at my computer, and suppose I want a share of Apple - there isn't a button that says "Buy Our Stock" on their website. There goes my one idea. Where do I go and what do I do there?)
I am female. I put soap on a washcloth and rub it on my body, then rinse well. Once out of the shower or bath, I use body lotion. I am frequently told that I smell good and/or delicious, so I'm pretty sure I am doing it right. :) If you have dry skin, use lotion or look for a soap that is milder. I have a lot of allergies so I use Ivory, which doesn't have a lot of extra perfume and no colourants or other additives. You can also use small-batch artisanal soaps, which are risky if you have allergies but may be less drying because a lot of them are superfatted and/or made with goat's milk and that sort of thing.
I don't like bath poufs because they feel weird and are gross over time. I own a loofah gourd, which I use when I feel particularly needful of exfoliation, but mostly it's the washcloth for me. Basically it's going to be what kind of texture you like to feel, as far as what you use for scrubbing (a lot of people use their hands, but I don't feel clean enough if I do that), and product wise, use what makes your skin feel good.
For hair, go get a good haircut from a good stylist. If you are paying less than $30 in most markets you are getting a dreadful haircut. I routinely expect to pay $70 for a haircut because I have thick curly hair. If you like what the stylist does, ask them to recommend products and show you how to use them. If you do not, wait till it grows a bit, try another stylist. Ask your friends and coworkers where they get their hair cut. If you have a male friend who always looks particularly well-groomed, ask him who does his hair. This is how most people find stylists.
Products and tools are very important for hair.