Enjoy the ability to create opening repertoires for every and any opening you can think of! Review the line over and over to cement it into your brain. Play the resulting positions versus Stockfish 15 NNUE in order to discover any counter-play.
Don't worry about buying each course for 60 dollars; input as many different openings as you want. Source the openings from engines, and books to create your own repertoire that fits your playstyle.
With this Chess tool you can have as good of opening preparation as Fabiano Caruana and then still blunder your queen in the middle game!