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I've made a folder with a bunch of these learning resources in it too if you want to dig through that too: https://github.com/nerd2ninja/bitcoin-sop/tree/main
The level of security you employ should correlate with the amount of BTC you have. Would you leave your US dollars on Cashapp? If so you are probably fine leaving a little BTC on there. But long term your best option is cold storage, either buy a device (like Ledger NanoX) for $50-$100, or go to bitcoin.org and download the Bitcoin Core GUI, where you can create your own cold storage wallet. You can generate your own seed phrase with no third parties or extra costs.