These are the website I filtered them to from more list. I thought I should let the newbies like me know about it. Any of the websites are good for this purpose but 1-5 are most popular.
1- https://www.blockstream.info
2- https://www.mempool.space
3- https://www.blockchair.com
4- https://www.BTC.com
5- https://www.blockchain.info
6- https://live.blockcypher.com/btc/
7- https://oxt.me/
8- https://www.blockonomics.co/
Of all the links in the list, 3-4 are known to me, and I use only 2. Moreover, to perform various tasks. In fact, a beginners doesn't need so many services, but knowing about the existence of alternatives will be useful, because it allows you to choose the right one for everyone. If I had this list as a beginner, then it is possible that my choice was on other sites, and not blockstream.info and mempool.space, but now I don't want to change my habits.
Thanks @Call_Me_Guru for posting this list here. Now I will know where to watch it if I want to diversify the bitcoin explorer.