what is shikakai - #24015

I am really curious about what is shikakai because my hair has been such a mess lately. I’ve been using all these expensive shampoos and conditioners because they said they’re good for hair growth, but I honestly don’t see any results! Like, my scalp gets itchy and there’s this constant buildup that just won’t go away. Got tired of it, you know? A friend mentioned shikakai and I googled it, but all the info seems kinda overwhelming. I mean, is it really as good as people say? I saw some videos showing how to use it, but they make it look so simple. Can I just mix it with water and create a paste? What’s the best way to apply it, should I use it like a regular shampoo? And like, does it actually help in combating dryness or promoting hair growth? What is shikakai's effect on different hair types, is there something I should worry about? Trying to sort this out ASAP because my hair is driving me nuts!