Migrating to grapheneos.

I’m thinking of migrating to grapheneos from ios, what are some things that I should be aware of? Keep in mind, I haven’t used android in about 3 or 4 years and have basically been using an iPhone since the 3GS. Any heads up or tips would be helpful. I’m just really tired of apples new business model and current executives, and am trying to move to all free software. Thanks in advanced.