How many coins can be stored on the Ledger Nano S?
In principle, you can store as many coins/crypto currencies on the Ledger Nano S as you like. The hardware wallet only stores the private keys that ensure access to the coins. To manage the coins, the corresponding app must be installed on the device.
However, depending on the combination, you can only install a maximum of between 3 and 20 apps at a time. This is because the memory of the Ledger Nano S is limited. However, it is not a problem to switch apps by un- and install, so the coins are not lost.