Four networks.
One familiar place.

A stablecoin is a token designed to keep a steady value, usually by tracking a currency such as the US dollar. It lives on a network like any other token, so the same stablecoin can exist on several networks, and those versions are separate. How steady it is depends on how it is backed and managed, so it is worth knowing who issues it.

After you send, your transaction waits to be included in a block, and it shows as pending until then. On Ethereum, Solana and Tron that usually takes seconds; on Bitcoin a new block arrives about every ten minutes. When a network is busy or the fee is low, the wait can be longer.

A block explorer is a public website where anyone can look up addresses, transactions and blocks on a network. It only shows what is recorded on the blockchain and cannot move anything. Each network has its own explorers, and they are handy for checking whether a transaction went through.

Your total is what you hold multiplied by current market prices. Your holdings only change when you send or receive, but prices change all day, so the total can rise or fall on its own. A chart of past value uses historical prices to show the same holdings over time.

Each network counts in tiny units so amounts stay precise. One bitcoin is 100 million satoshis (sats), one ether is a billion gwei, one SOL is a billion lamports and one TRX is a million sun. You will mostly meet them in fees and technical details.

Be wary of anyone who asks for your recovery phrase, creates urgency, promises to double your crypto or contacts you first as “support”. Check an address carefully before sending, because blockchain transactions cannot be reversed.