you've already made a pretty good small chain, so try adding another group of three, divide it with a three of another color, followed by one of the old color on top. learning to do this quickly, at its core, will help you improve

google chain methods, might help!!

There are few ingame tutorials, they can cover few basic contepts while you just keepbplaying and get better feel for the game, then try searching up on the internet more advanced concepts