Quickly understand JavaScript observables. Implement the Observable class from scratch and understand what makes observables different from promises.

The AWS VPC tutorial, including what is Amazon virtual private cloud, ipv4 vs ipv6, subnets, route tables, security, gateways, and examples.

Spring Data JPA tutorial including creating entities, repositories, CRUD operations, entity relationships, setting up the mysql connection and running the application.

How Kubernetes works including worker nodes, the control plane, objects, and an overview of Kubernetes architecture and concepts.

What is Kubernetes including what's a container, containers and docker, Kubernetes and containers, and is Kubernetes free?

How npm update works, including how to update packages to specific versions, updating dev dependencies, updating package-lock.json, and troubleshooting npm update not working.

The npm install command and how it works with and without arguments. Learn what happens under the hood with dependency resolution and the difference between npm dependencies and devDependencies.

Everything you need to know about lambda expressions in Java, including what lambdas are, syntax, reasons for using lambdas, the java.util.function package, lambda scope, examples and more.

MongoDB $lookup examples including pipeline example, joins, and $lookup with conditions. Quickly understand $lookup aggregations with these examples and explanations

The MongoDB aggregation pipeline quickly explained with examples for $match, $group, $sum, $unwind, $project