This is a nice website that shows mempool information. But there are many others:

http://Https://Mempool.space (I believe the best one)
http://Https://mempool.observer
https://bitcoindata.science/plot-your-transaction-in-mempool.html (I created this one)

Mempool information is very important to choose the best fee for your needs.

wow that's so cool.
how long will it take you to make this project : https://bitcoindata.science/plot-your-transaction-in-mempool.html

I was re-learning javascript by the time, it took me like a month in 2020. But I can do something similar now in a few hours/days.