Great advice Big Fish! Good video on backlash Hoppy!
All good....
Just takes some practice....it will come
God Bless

the only thing I would add to what bigfish said.. is even though you have the tensioner set to stop the line when it hits the ground just hanging from the rod tip.. when you cast the weight, you have to clamp your thumb down on the spool the instant the weight or lure hits the ground or water. The centrifacle force on the spool is much greater when you have made a cast vs just letting the weight drop from the end of the rod. A back lash is guaranteed if you don't clamp that thumb on the spool.

Good luck, we all started somewhere
BD

Too much line on the spool can make your reel more likely to backlash. Try stripping some line off if you have tried all the above and your reel is still too sensitive.

Also a great tip that I use when teaching some1 to throw a baitcaster. Is make 1 long cast then before you reel it in take about a 3in strip of electrical tape and put it on the spool under the casted out line. Doing this prevents any back lashing beyond the point of the tape

When I was learning I had to take the wrist action out of the cast. With a spincast reel you can really try to "crack the whip" with your wrist.....Just use a nice smooth casting motion with no wrist action for a while. Let your forearm and shoulder do the work.

bigfishtx has some good advice above.

Another tip I use to help beginner baitcasters is this..

Once you have adjusted the brakes on the reel and you are ready to make the cast, hold the rod out in front of you. Rotate your wrist so the reel handles face upward. Now aim at the sky, like you are trying to try your bait up into the clouds and throw it. Handles up, throw up! LOl

It helps a lot of folks.