Learn how to write unit tests for controllers, models, and services in CodeIgniter to ensure the reliability and maintainability of your application. Discover best practices for structuring test files, using the CodeIgniter testing framework, and catching bugs early through effective testing methods.

Learn how to apply unsupervised learning techniques in R, including K-means clustering to group similar data points into clusters and Principal Component Analysis (PCA) to reduce dataset dimensionality. Discover how to implement these techniques using R's built-in functions and explore example use cases with the iris and mtcars datasets.

Building Scalable Web Applications with Django Framework: Mastering RESTful APIs with Django REST Framework. Learn how to create API endpoints using serializers and viewsets, and discover the key concepts and best practices for building scalable web applications with Django.