Nigel Smart's Cryptography Made Simple is a great book which covers elliptic curve cryptography amougst many other topics; despite its name it's a very technical book, but it's easily accessible to anyone with a CS/EE/Maths/Physics degree.
Agreed. Also Christof Paar's book [1] and 25-episode YouTube series[2] do an excellent job of explaining not only elliptic curve cryptography, but also RSA and a lot of other cryptography, including symmetric ciphers and cryptographic hash functions.
The blog post seems to be essentially, "I read these good posts on Ars [3] and F5 [4] [5] and here is my summary of my understanding of them". Nothing wrong with that, but the post has some issues and doesn't add anything to the sources cited IMO.
You can grab a copy from SpringerLink for free at the moment here: https://link.springer.com/book/10.1007%2F978-3-319-21936-3