1. What are a few good Crypto exchanges?
Decentralized and P2P exchanges.
2. what are some good Hardware wallets?
Hardware wallets with open source code, airgapped devices, and something you can build yourself.
Trezor is OG hardware wallet but there are other solid alternatives that are open source.
5. what is the most secure way to store crypto?
Using encrypted passphrase is the best simple option, maybe using something like Satochip, and for more complicated option there is multisig setup.