Question About NTLM

I've been doing a lot of research into how the NTLM hash works, according to https://asecuritysite.com/encryption/lmhash an NTLM hash is ASCII input > UNICODE > MD4 Hash.

I don't quite get how this works, also I think his example was messed up.  Anyway, could someone explain it to me or provide a site that can, please.