By the end of this you will be able to look at any coin or token and know what KIND of thing it is in seconds, the same way a naturalist names an animal on sight.
Open any exchange and you will see thousands of coins, each with a chart, each promising something. It feels like you are supposed to pick winners.
You are not. People who actually live in this space never ask which coin. They ask which kind of thing they are looking at.
There are only five kinds. Learn them once, and the noise turns into a field guide.
Here is the whole field guide before we walk it. Five buckets, five species. Memorize the shape of the board, not the prices.
Tap each species on the board to read its one-line trait.
The first animal is the easiest, because it is alone in its bucket. A scarce, deliberately simple record of value that most people buy and then leave untouched.
Where does BTC belong?
Next is the fuel. The platforms that apps run on charge you in their own coin every time you do anything. On Ethereum that coin is ETH. On Solana it is SOL.
You do not buy these to admire them. You hold them to pay for usage. Where does ETH go?
The third animal does something the others refuse to do: it tries to stay still. One unit is meant to always be worth one dollar.
This is the working money of the space. Most trades and most on-chain salaries settle here, not in a coin that swings every hour. Where does USDC go?
The fourth animal belongs to one specific application. A token tied to a single app, often giving its holders a vote on how that app is run.
UNI belongs to the Uniswap exchange. AAVE belongs to the Aave lending app. What each is actually worth depends entirely on its app, so this is the most varied bucket. Where does UNI go?
The last animal is the most honest about what it is. It runs on culture, community, and the casino instinct. No fuel job, no dollar peg, no app underneath.
Dogecoin literally began as a joke in 2013, a parody of crypto mania, and a real community grew around it anyway. That is the species in one story. Where does DOGE go?
Now the first warning, and it catches almost everyone. A low price per coin feels like a bargain and a head start.
Your friend is excited because a coin costs a fraction of a cent. What is actually wrong with their reasoning?
Now the honest part, because the field guide should not turn you into a cynic. Your friend swings the other way and declares the whole memecoin bucket a scam to be avoided on sight.
Where is he wrong?
You now hold the field guide. Five species, and a method: when a new coin appears, do not ask whether to buy it. Ask which bucket it belongs in, and judge it by the rules of that species.
Notice that two of these animals do most of their living in one place. The stablecoins and the app tokens spend their days inside the same district.
That district is DeFi: a bank with no staff behind the counter. Time to see how it can possibly work.