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1: A hardware wallet (like ledger) only stores your private keys securely, not the coins themselves… Because of this, even if ledger was to go bankrupt, you will always be able to recover your seed using another wallet application (instead of the default ledger live application)
2: yes, you are correct… Ledger live has a very easy user interface that makes buying and selling direct to self-custody very simple for beginners; but with convenience comes fees. Cheapest way is like you said, buy on another exchange with low withdrawal fees and transfer over to ledger
3: just like number 1, your ledger just stores the keys to your nft’s and then your ledger can ‚connect‘ to opensea for viewing, selling, etc…
Most important thing to note: your 24 word seed phrase is still ‚gospel‘ and your ledger just secures those words so you never have to type them into a keyboard. One you set-up your ledger (ideally) you’ll never need to type in your 24 words again but Don’t ever lose your seed phrase because if your ledger dies, you’ll need to buy a new one and restore the original 24 words.