A small criticism for an otherwise great effort OP:
A recovery seed is also referred as a "backup seed", "recovery phrase", "backup phrase", "private keys", etc.
A recovery seed is definitely not also referred to as a "private key", and if it is, then it is being done so incorrectly. They are two very different things. I would remove the words "private keys" from this sentence.
Although a great post, it definitely does not fit with a "quick guide for beginners".
I think you should include Ownbit in the wallet list. I think it's the best compared to any others.
The website links to a GitHub, but the GitHub page simply contains a bunch of forks of other projects and some vary basic wallet code which is over 2 years old. Based on that, the wallet is not open source and therefore should not be recommended.