SMTP ports 25, 465, 587 and 2525 explained: what each is for, how STARTTLS and implicit TLS differ, and which port your app or device should use.
A practical open source security routine: inventory components, track advisories, patch safely, harden configurations and plan for end-of-life versions.
TLS 1.3 vs 1.2 compared: the faster handshake, removed weak ciphers, mandatory forward secrecy, and how to enable and test TLS 1.3 on your server.
Native vs cross platform app development compared: performance, cost, user experience, device access and team needs, with a guide to choosing.
Why DNS changes take time to reach everyone, how long propagation really takes, and how to make your next DNS change spread faster.
How software project estimation works: the main techniques, why estimates are ranges, what drives cost, and how to get quotes you can rely on.
The web application development process from discovery to launch and beyond: what happens at each stage, what you receive and where you get involved.
A practical guide to server monitoring: the metrics that matter, sensible alert thresholds, avoiding alert fatigue, and tools to get started.
Subnetting explained step by step: network and host bits, subnet masks, and worked examples splitting an office network into smaller subnets.
How a recommendation system works: simple baselines, co-purchase SQL, collaborative and content-based filtering, cold start, testing and privacy.
Is a multi cloud strategy right for you? The real benefits, the hidden costs and complexity, and practical patterns that work for smaller teams.
MySQL vs PostgreSQL compared on features, performance, SQL standards, extensions and hosting, with clear guidance on which suits your project.
