Idk I'm resharing what my friends share with me. No idea. I'm sure there are apps out there that make these easier.
On iOS with damus you can highlight snippets on safari, optionally add a comment, and publish to nostr. Here is the highlights support matrix: https://github.com/nostrability/nostrability/issues/61 https://image.nostr.build/41dbdfdce66cb16479b51c09b758318bbf74d0333dacebcc4ef960041b60b2c2.jpg https://image.nostr.build/c0f9855c7a8c190810c0f0281be7a163c29d8b03e4de7b82a27bd1a71577d06f.jpg https://image.nostr.build/cd2f91f7dac5e82b55111fc5162c6bb08919e62bc905e7ceaeb1c55a1b1071f1.jpg