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 spend a fair amount of my time off work either on public transportation or in coffee shops, and have found that how receptive people are to starting conversations varies widely within these settings.
On public transportation, there are observations one can make which can aid with determining whether someone is open to conversation. If they are already engaged in conversation with another passenger and appear either happy or lost, it is more often appropriate (people who are happy tend to have farther to go on their mood spectrum to get to creeped out or annoyed, as well as sometimes, as with the people I befriended a couple weeks ago, being in the mood to share their happiness with others, and people who are lost generally appreciate direction or at least a clarification of where they are on the map). A person confined to the seat next to you is less likely to be happy about a conversation, as they will feel they have less of an exit than, say, in a section where all seats face a middle aisle, meaning the area in which the conversation takes place is felt to be larger. In my experience, few people like to start conversations on their morning commute. So the important factors which determine whether it is appropriate to speak to someone on public transportation are time of day, physical position, and mood.
Coffee shops follow similar guidelines: it is often appropriate to chime in to existing conversations (as long as the conversation is not romantic or argumentative in nature). When a person might be forced by lack of seating to share your table, it is not appropriate to start a conversation if both of you have laptops, as you can be reasonably expected to be engaged with other people or projects. If the other person does not have a laptop or other electronic device with which they are engaged, it is generally appropriate to start a conversation.
I have found coffee shops environments where it is sometimes received well to butt in to interesting conversations. This has led to a few rebuffs, but also some highly interesting conversations. When people were gathered in the coffee shop for a purpose, such as a poetry reading, there was a significantly higher proportion of interesting conversations to rebuffs.
Public transit talkiness varies a lot by city. In Boston, it's minimal. I understand in other cities, conversation is much more normal.
It's my experience as a young woman that the only people who try to talk to me on public transit are men. If you're a man, know that young women you try to talk to are probably going to assume you're sketchy because they've been approached by so many other sketchy men before.
I veto talking to anyone who is reading. A possible exception might be if you've read what they're reading and ask their opinion of it, or similar.