The supply in the crypto world refers to the number of coins or tokens circulating in the market.
Like rare goods, if the supply is limited but there are many buyers (high demand), the price tends to rise. This is very important for "The Long Game of Crypto".
Understanding supply helps us see the potential scarcity in the future. Some crypto assets have a predetermined supply schedule, for example, $BTC with its halving that reduces the rate of new supply addition.
This predicted scarcity, over time and with increasing adoption, can be an important driving factor for long-term value. So, pay attention to supply when looking at crypto assets for long-term investment.
