If you consume these materials, you will end up as a very bad loser because most of the strategy they will teach you there are obsolete and not suitable for the current market conditions that is highly manipulated. If you want to learn about good strategies, avoid those courses in exchange and use Youtube that is filled with recent courses that can help you achieve profitability faster. You can also add some lectures on trading psychology to help with the emotional aspect of trading which is also very pattern.
I don't really think so, since I believe that a general trading guide doesn't have a specific time frame if when will they work. Like for example, they will only teach you if what is the chart, the candles, and so on... and how to use them. Some makes us see the time when they posted the tutorial but we shouldn't mind that.
There are still some authors that updates their write-ups but I think they mainly fix the typos, so the change may not be that drastic. You mentioned Youtube there but he also said it above. We must only be careful if we don't have a direct link because it is only easy to get lost there, as Youtube is like a huge jungle now with lots of wild animals or the click baits and misleading videos that only wants to benefit from us.