Intellipaat has a large repository of online resources for learning Hadoop. As a learner, you can start from the beginning by going through this video on the Hadoop tutorial for beginners. Also, to have a better overview of the Hadoop course overview, you can go through this Hadoop tutorial.
If you wish to learn Hadoop in detail, check out this professional Big Data Hadoop Course.
Watch this insightful video tutorial on Hadoop to know more about it:-