Link to course: https://www.udemy.com/course/learn-big-data-the-hadoop-ecosystem-masterclass/?referralCode=6CEDC783C12FC5B4B4C5
There are multiple ways to do an installation. The best way in 2025 is to use Ambari 3 to install the OpenSource Hadoop Stack. For instructions on how to install a 4-node hadoop cluster using docker, have a look at the ambari3 README in this repository.