What it is
Canal fishing is a venue approach. The cut is linear and shallow, with a near shelf, a track, and a far shelf against the vegetation. Roach are the soul of it; perch, bream, carp and tench all show up. Boats colour the water and move fish; then the fish settle again.
You do not need a barrowful. A pole or a float rod, punch or maggot, and quiet feet will outfish a feeder crashed into the far rushes. Pick a line — far shelf, track, or near — and stay on it long enough to learn something.
Most canals have no coarse close season. Some canalised rivers and SSSIs do. If it looks like a river in a straight jacket, check before you fish in spring. A Canal & River Trust water or a club stretch may need a permit on top of your rod licence.