Point the camera at the slate's Jam Phones code, or at Tentacle Timebar's QR Timecode. Let it fill most of the screen and hold steady for a second.
Markers: in Resolve, right-click the timeline in the Media Pool → Timelines → Import → Timeline Markers from EDL. They land on the timeline by timecode, so use a timeline whose timecode follows the camera. For clips shot without timecode: with One per Clip, drop the clip at the start of an empty timeline; with One for the Day, they follow the timecode clips, each from the next whole minute, and the clip's marker shows where to drop it.
Keepers stringout: File → Import Timeline, to build a timeline of just the good lines from footage with timecode.
Subtitles: File → Import → Subtitle, then drag onto the timeline.
Change a mark's type, edit its note, or remove it. Changes are saved right away.