Let me introduce you all to the building trades concept of "buying your book."
A "book" is (a slightly outdated beyond this specific topic) term for your union card, which states that you're a member in good standing of your local/union and ostensibly means that you have the coinciding skills that go with the title of journeyworker or apprentice or whatever. Typically, to become a journeyman, you serve an apprenticeship (usually 5 years) and then have to take a test of some sort to prove you've acquired all the necessary skills to earn the qualification. The card/book is the proof that you have a basic level of competency.
Sometimes though certain locals, usually in the South or other places where right-to-work or similar attitudes are stronger, will "sell books," which is to say they will allow people who either haven't served an apprenticeship or passed a skills test to buy their card so that they may work on union jobs.
There's a myriad of reasons and reasonings on why a local might do this, but on the ground, it means that if I'm on a big job, anyone from areas or locals that have a reputation for selling books is automatically assumed to be under-qualified. This sucks, because I've known plenty of badass hands from Southern Locals, but because they come from book-selling locals, they had to overcome that stigma. To an extent, this whole thing is self-regulating because if you bought a book and can't hack it, you only come to a travel job once before they will never invite you back, but it is a constant source of sand in the gears for the whole labour management process.
Anyway, learning is important and faking learning WILL bite you in the ass if you have any desire to exist in the world in a meaningful way.