A collection of my favourite resources.

A beginner’s guide to Big O notation
For anyone not quite sure what it means when you read O(N), O(log N), etc, this is the article for you. Concise and easy to understand, with examples.
Neo4j GraphAcademy Online Training
If you are interested in graph databases and the Neo4j graph database then these free online training courses are a great starting point.
Free Code Camp
Learn to code for free. Build projects and earn certifications to start or progress your coding career.
Azure Pricing Calculator
Useful tool for predicting the cost of resources in Azure.