i never heard about ATL ever. Since now. Maybe i am not that informed.
"ATL" refers to any crypto that isn't BTC (or ETH).
ADA, VET, SAFEMOON, Litecoin are all "Alt" coins.
Alt coins higher risk vs reward.
If you can get in at the start of a coin for cheap and hold for X months/years you can make some serious gains or losses.
FLURMOON is a good example. It is a new Defi token that has some serious potential to give holders some real gains.
Also do your own research and invest what you can lose.