Need advice (new ledger user)

I recently bought a Ledger Flex hardware wallet and I’m a bit confused about how it works. I currently have my crypto stored in Exodus, and I want to transfer it to my Ledger to keep it safer. However, I’m not very familiar with the process, so I have a few questions:

1. In Ledger , I can only see Ethereum app, but most of my funds are in Tether (USDT) on BEP20/ERC20 and USDC on the Solana network. Why aren’t these showing up?
2. If I send my funds to my Ledger, will they be stored directly in the Ledger wallet? And does that mean I will always need to use the Ledger wallet whenever I want to send or make payments?

I’d appreciate some guidance on how this works.