Articles and videos are good in learning poker. However, you should practice and apply it since experience will always be the best teacher. There are a lot of things that you can learn by playing than reading or watching tutorials. I learned poker just by watching my friends play and slowly I started playing and applying what I have learned and observed. Poker is not just about the game concept itself, what makes it fun is you can win with bad hand if you know how and when to bluff. This is something that you can read but learn by yourself.
We can learn poker through so many forms even without reading a book or in searching of a material to use and learn. There are so many videos on YouTube we can always use to learn poker and have new strategies without depending on a particular source.
There are so PDF we can search online that can help our learn and have good strategy that can be useful to us.
While it is true the options seem limitless when it comes to learning poker, it seems to me that a good option is to try to learn from the courses of the best poker players around the world, since you know that they actually live out of poker and they are not just writing the book to earn money with it.
Now it is important to also recognize that what works with the pros using high stakes may not necessarily work on small stakes poker, and as such some adjustments could be needed before you play poker professionally.