My Neural Network isn't working! What should I do? by/via @anorangeduck

11 things you probably screwed up and how to fix them.

This is a vital list of things to check and you should bookmark it so you can refer to it in the future.

Data Modelling and E-R Diagrams by Nagesh Kumar G via @DataScienceCtrl

We can subdivide the process of designing a database into three separate phases: Data Analysis, System Design, and Technical Design.

I would also draw you attention to normalisation.

And slowly changing dimensions.