A working OpenSource Symfony 3+ project for learning?

Question

symfony

I found a bunch of projects on the git, in fact, errors climb out of them like cockroaches from the trash.
Are there any good, live OpenSource projects to learn from?
They should use Doctrine, Repositories, Enteties, SQL, no DQL.
An elementary blog will be enough to understand the basics. Nothing extra.
For now I'm sorting through different ones, like there is a code, but I put it, so errors come up, because the versions, the environment are different, etc.

Answer 1

There is a translation of a chic tutorial - creating a habr blog .
Yes, it is based on 2.8, but the 3rd version does not differ much, this is more than enough for learning, and after understanding symfony comes, you can see the differences between the triplet.

Answer 2

This will not work https://github.com/symfony/demo ?