Best Walkthrough/Tutorial Today (Data Scientist writing their own pipelines)

[Jordan Thomas-Green]

Hi-
 I'm looking for the best walkthroughs/tutorials/resources for a data
scientist writing their own pipelines. Primarily looking for Java
implementations but Scala and Python are ok too. Looking for resources
that 'hold your hand' a lot more than the Github repos due to all of
the Java constructs one would have to learn (annotations, passing in
class files etc) and are of a broader reach than the Beam Katas etc.
What are the best resources you've seen?