Fishing shop -- sells fishing rods, bait, lures. More on those in that section.
Fish Market -- allows you to sell fish. Different markets (locations on the map) will sell them for different prices.
Eatery -- sells food. More on this in the food section (probably next).
Hostel -- sells sleeping space for the night. Very necessary unless you want a high chance of sleeplessness and a decent chance of dying.
Grocery -- you can buy foods in bulk here so you're not spending money at eateries, however you need cooking equipment, hostel use will be more restricted around it, and there are more deleterious effects from these foods.
Specialty shops -- sell upgrades to stuff like life extension or night fishing modules that you realistically can't afford.
Leisure shops -- sell items that drastically increase long-term comfort that you also can't afford. Additionally you can't go in here without being clothed right and the police will probably be called on you if you don't buy anything. This kind of mechanic reinforces the dystopian nature of the game lore.
Pharmacy -- you can buy stuff to prevent or cure illness/pain/injury, but it's stupidly expensive. Prevention is cheaper but it's short-acting and expires easily so you get priced out of that at your financial level.
You can steal stuff (with a lot of confirmation), but without a high Theft skill you're most likely going to get caught, and jail time is *very* deleterious in this game. Not paying taxes can also lead to it, sleeping on the streets can (depending on the province, some have a higher murder rate instead). It's *possible* I guess to be a thief but you'd have to do an impossible amount of bootstrapping to hit that.
Coffee -- lowers sleepiness but has addictive potential.
Alcohol -- increases comfort and improves sleep quality but addictive and at high long-term use has vitality issues.
Tobacco -- increase to comfort and decrease to hunger rate, however highly addictive, expensive over time and deleterious vitality.
Soft drugs -- improves comfort and/or vitality for relatively cheap, not very addictive, however highly unjustifiably illegal.
Hard drugs -- boosts comfort, sleepiness, hunger significantly, but expensive, highly expensive over time and also highly illegal.
Coffee, beer and tobacco are available at groceries, with more variety available at specialized shops (which may or not exist, depending on the economy of the town). The drugs require, uhh... seeking people out and asking for drugs, which is a whole other set of unfleshed mechanics.
Addiction
Addiction will do two things:
Whatever stats it buffs it'll do the opposite unless you get the addictive substance.
Your tolerance will go up and you'll need more of that substance to get the same effects.
Additionally, some drugs have worse effects the more of them you have, so the tolerance/withdrawal thing will make those issues compound. Soft drugs and coffee max out somewhere.
Addiction comes from exceeding the addiction potential stat. Each use increases this stat a bit, and it goes down over time. The amount you fill this stat depends on the drug but also the status of the stuff you're affecting-- if you're super burned out, you're more likely to hit addiction
Addiction can be reduced by time without the drug, though you get the withdrawal effects during that time. It also decreases more slowly than the time it takes for addiction potential to decrease. Addiction is also permanent -- the tolerance/withdrawal aspects won't be, but future uses of that drug will trigger full Addiction again. This state is known as Sobriety. You may also occasionally get cravings -- deleterious effects unless you get the drug. These go down in frequency over time.
Hunger -- after 3 days you die, additionally hunger that's below 0 will cause strength loss and increase sleepiness rate / lower sleep recovery. Hunger is both a stat and a rate -- Food improves the stat, while things like tobacco and certain types of Food can improve the rate.
Sleepiness -- Sleeping will recover this stat, with it compounding for continuous sleep, so sleepless nights you'll need more actual sleep to go back to normal. Or something like this. The more sleepy you are, the less alert you'll be, which has effects in reading (can't read as well), day fishing (fumbling and stuff) and night fishing (potential of drowning). Additionally if you're sleeping on the streets or your criminal stat is higher it'll be harder to avoid the police.
Vitality -- your overall health. If this is low, you're more likely to get illness or injury. Vitality is tied to Comfort, Food quality, and other stuff. Working too much will lower your Vitality as well, and the game is set up to where you have to overwork, so.
Stress --Decreased by reading, particularly banned books. Affected by Food quality, relaxation time, leisure items you can't afford, etc. You ideally need 8 hours of relaxation to recover this stat, but this is intentionally basically impossible to achieve, so things like high-comfort Food and drugs become more essential. At high levels your Vitality is affected and you're also more likely to aquire criminality. At extreme levels you get burnout where you can't work period, fuck the consequences.
Criminality -- this stat goes down over time, but goes up if you do antisocial stuff like shop high-value shops without buying stuff, there's a chance when using illegal items, if you sleep on the streets, etc. You also have to pay taxes, which are sometimes egregious and stupid. Criminality also goes up if you don't have enough money to afford taxes or stuff in shops. Obviously stealing will raise this a lot. Lategame choices might max it out.
Criminality will go down over time. The higher it is the higher the chance of you getting arrested, though the actual arrest rate also varies on the location. More on that on the jail section.
Money -- your money. Selling stuff makes this go up, buying stuff or paying taxes makes this go down. You can also be robbed if you sleep on the street and are sleepy enough. You can't go negative, however there might be a kind of loansharky system for debt with interest and collateral.
If you get arrested, you get tried and convicted in a kangaroo court for various stupid-sounding crimes.
Getting arrested incurs a cost -- this can be paid over time but it hurts. Not paying it makes your criminality go up a good bit.
Jailtime itself is done by performing Work to lower your sentence time. Food is free but it's gruel and you stay perpetually hungry (not enough to die from starvation though -- weekly feedings will be just enough to pull you out of that range, or however the math works). Work is identical to in-game Work except you commute your sentence rather than earn money. Stress levels are definitely going to rise.
Work
You can do various types of unskilled work in markets for money. Useful for extra cash or if the fish conditions or weather are bad or w/e. Unskilled work is a series of repetitive tasks that involve waiting but not as much waiting as fishing. It's extremely boring and makes fishing look fun. You also can't read while you Work.
Work will earn you some amount of guaranteed and fixed money per hour. Various types of work may pay more but are more illness or injury prone or have longer shifts and so impact your sleepiness. You can also get written up/fired for making too many mistakes, which illness/injury can cause them so. If you're fired you can't work that job again and will have to wait longer to get a new job even if hired. If you make too many mistakes at a jail job you just don't get as much food, so it's entirely possible to starve to death in jail if you fuck up too much.
