What is good for hair loss?

Lately, I keep feeling that my hair is falling out a lot.

Actually, since my hair is long, I feel like I lose a lot when it falls out~

But this falls out in handfuls, so I'm amazed that I still have my hair~

And when I hold it with my hand, I feel that it has decreased a lot compared to before ㅠㅠ

I was really worried about it~

Please let me know if anyone knows what is good for hair loss~

And please also recommend the effective shampoo~