Today, a good way to check your skills is to take a certification, it is a document which guarantees that the consultant knows a determined scope of expertise.
In addition to passing the exam during the MCQ, you have to get the awesome Lightning Web Component badge :
To unlock the passage of this great badge, you must first complete another series of badges:
Tools for reviewing:
All topics are covered even more than what is necessary for certification.
Trailhead also offers a guide on scope of certification, more precisely 3 badges:
It is possible to train with an example of MCQ from the SalesforceCert site:
If you do not wish to read, it is possible to go through youtube videos, here is the link :
Reviewing this certification takes time!
I hope these few links have been of use to you.