It is BTC not BC if you are referring to bitcoin.

These threads would be if help:
Minimizing bitcoin transaction fee
Bitcoin Transaction Fees - Everything in one
List of Bitcoin Mempool Viewers for Reference

Fir mempool observer, you can use https://mempool.space/ for beginners or https://jochen-hoenicke.de/queue/#BTC,24h,weight for advanced users.

Know that fee is in Satoshi/vbyte not BTC/satoshi.