Moving to Node as a FrontEnd

I am a FrontEnd engineer with more than 10 years of experience,
Recently I found out that market has been changing and now a full stack is more required than before (or at least the FE should know in a proficient way a BE Language) so I decided to move to node as the learning curve will be easier.

  • Any recommendations to become a proficient Node JS developer? Should
  • I learn a DB such as mongo or is it better a relational kind of BD?
  • which framework should I learn? Node or Nest
  • which things should I avoid in order to truly understand the node
    philosophy.

Thanks!