What is free line fishing?

Drifting involves simply allowing the boat to drift downcurrent as the angler uses the line reel's drag to control the depth and speed of the baited hook as it sinks

Trolling:

Trolling involves towing a line or lines at a depth and speed that entice the fish to strike the bait. Trolling is most effective when done while the boat is under power, as the motion of the boat creates additional action in the bait, making it more attractive to fish.

Casting:

Casting involves throwing a baited hook into the water from a stationary boat. The angler can then use the line reel's drag to control the depth and speed of the baited hook as it sinks, or they can allow the bait to drift naturally with the current.