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Explore the latest tutorials and guides across Linux, DevOps, programming, and more.
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2233 articles
Kubernetes Operator vs Controller vs CRD: What's the Difference?
A Custom Resource Definition (CRD) is the API contract, a Controller is the reconciler that watches and acts on it, and an Operator is the combination of a CRD …
Server-Side Apply (SSA) in Kubernetes Operators
Server-Side Apply (SSA) is the modern way for operators to express ownership of fields in a Kubernetes object. Instead of doing a full Update with a stale copy …
AWS Tutorial for Beginners - End-to-End Cloud Hands-On
Free, hands-on AWS tutorial covering CLI, EC2, S3, RDS, Lambda, DynamoDB, CloudFormation, CDK, Application Load Balancer, Elastic Beanstalk, CI/CD, and Amplify. …
Ethical Hacking & Penetration Testing Tutorial (Hands-On)
Free, hands-on ethical hacking and penetration testing tutorial - lab setup, reconnaissance, password cracking, phishing, web/mobile pentesting, MITM attacks, …
Git & GitHub Tutorial for Beginners (with examples)
Free, hands-on Git and GitHub tutorial that walks you from `git init` to advanced rebase, stash, and history rewriting in 14 chapters. 60+ examples tested on …
Golang Tutorial for Beginners (Hands-On)
Free, complete Go (Golang) tutorial in learning order: install, modules, syntax through structs, error handling, I/O and JSON, then goroutines, HTTP, databases, …
Java Tutorial for Beginners (with examples)
Free, complete Java tutorial for beginners - install JDK, variables, operators, control flow, OOP, collections, streams, lambda, multithreading, file I/O, …
Laravel Tutorial for Beginners (Step by Step)
Free, hands-on Laravel tutorial - install, routes, Eloquent ORM, Blade templates, authentication, Sanctum/Passport, validation, file storage, queues, mail, and …
Microsoft Azure Tutorial for Beginners (Hands-On)
Free, hands-on Microsoft Azure tutorial covering App Service, AKS, Blob Storage, Backup, VPN, ARM Templates, Logic Apps, Cosmos DB, and Azure AD. 30+ …
Modern JavaScript Tutorial (ES6+ Hands-On)
Free, hands-on JavaScript tutorial - strings, numbers, arrays, objects, ES6+ features, classes, async/await, the DOM, error handling, and common error fixes. …
Node.js Tutorial for Beginners (Hands-On)
Free, hands-on Node.js tutorial - installation, REPL, file system, child processes, Express, MongoDB, authentication, error handling, debugging, and HTTPS. 35+ …
OpenLDAP Tutorial for Beginners - Install, Configure, Replicate
Free, hands-on OpenLDAP tutorial - install on RHEL/CentOS/Rocky/Ubuntu, configure TLS, set up master-slave and multi-master replication, integrate Linux …
OpenSSL & PKI Certificates Tutorial for Beginners
Complete OpenSSL and PKI tutorial - generate keys, build a Certificate Authority, issue SAN and ECC certificates, configure mTLS, renew and revoke certificates. …
Pandas Tutorial for Data Analysis (with examples)
Free, hands-on Pandas tutorial - DataFrame fundamentals, reading and writing CSVs, selecting, filtering, joining, grouping, reshaping, and visualizing data. 30+ …
Python Tutorial for Beginners (Hands-On)
Free, complete Python tutorial for beginners - variables, strings, lists, dicts, control flow, OOP, file I/O, error handling, regex, concurrency, and Flask, …