The video on understanding and navigating job boards refers to the hidden jobs market at the end because with so many ways to find jobs these days, it’s easy to forget that most job vacancies are never advertised.
Tapping into the hidden jobs market is more demanding than finding an advertised role. There are also no guarantees that it will work in the timeframe you have available to look for a job.
However, this strategy has the most potential for you to find a role that really suits you. It is also a very effective strategy for your medium to longer term career prospects.