Best lightweight Plugin to block bad requests

There are so many plugins available in the market today, even tough to find, which one is good or bad.

After trying some, I’m using this one for almost two years on my Website-https://www.easebedding.com/
And now I’m using for my these websites too:-

1-1-https://www.topbestspot.com/
2-https://bloggingcreation.com/
3-https://luxuryhomedecorforcheap.com/

And will continue to use it right now as a free and may be I’ll Update to Pro later after some time.

Thanks for this Plugin.