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This is a good starting point: https://btcguide.github.io/
If you prefer to listen rather than read: https://stephanlivera.com/episode/215/
Whilst the signing devices on offer for multi-sig, and Sparrow as probably best-in-class bitcoin wallet, are all new since Michael Flaxman wrote (and recorded) this, the reasoning and comparatives of single sig v multi-sig are really useful to work through