For hammocking sites, as plenty of others have mentioned check the strength and integrity of the trees youre hanging from and look for any widow makers.
For site selection in general I've found that Andrew Skurka really has this covered well - https://youtu.be/RdWdlkBJLJ4?si=IshNOcnFgkXw86sa
Where I live in MN most of the time Im camping in designated sites so theres no real option for me to pick, but when I'm out west its fun to pick your own site!
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