Bottom fishing is a very popular technique when barracuda are on the reefs and wrecks in deeper water. Use jigs, jigging spoons, live baits or cut baits. They will all work.
Casting is a popular technique, especially when fishing inshore, from the surf or piers. For the freshwater anglers that enjoy fishing for northern pike, barracuda are a bigger, stronger, faster version and they can be caught similarly. Fan cast the good looking spots and cover water to find active barracuda.
Drifting is a popular live bait or cut bait technique. If you find some structure near shore or offshore, you can have some success by drifting over it.
Still fishing is not a very popular way to fish for barracuda, but it can be very effective, especially if you are fishing a reef or wreck over deeper water. Inshore, some anglers will just cast out a bait and let it sit. It works as long as you are fishing productive spots.
Trolling is a very popular technique for barracuda. Anglers like to troll crankbaits and spoons mostly, however, there are a variety of rigs and baits that will work when trolling for barracuda.