Start here
Pick the path that sounds like you. Each one mixes reading with shipping, because reading alone doesn't stick.
New to data
Start at the bit
You know a little Python or SQL and want to understand what happens underneath.
Working with data
Fill the gaps
You write SQL and Python at work. You want the patterns interviews and real pipelines lean on.
Interview prep
Go straight to hard
You want timed-feeling, realistic problems: sessionisation, SCDs, log replay, vector search.