1- I found this website. Learning and training step by step, starting from zero.
It is in Dutch and it didn't work with Google Translate, but most exercises are self-explanatory and one picks up basic Dutch after a while:)
The e-book series of Tjalling Goedemoed (https://fmjd.org/promo/cid.php) claimed that these books go hand-in hand with the Dammentor website, but I couldn't manage to synchrone them. No problem though.
The website is a bit old, it becomes tedious after a while. Collective Lichess study project is indeed needed...