Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- Databases & data4 min
What Is Elasticsearch and How Search Engines Index Data
Elasticsearch is a distributed search engine that stores JSON documents in an inverted index, so it finds matching words across millions of records fast and ranks results by relevance; you need it when database LIKE queries can no longer deliver good full-text search.
Basics - IT careers3 min
What Does a Frontend Developer Do? Role, Skills and Tools
A frontend developer turns design mockups into a working website or web app interface: building the layout, writing JavaScript logic and connecting it to data from the server.
Basics - Tools & no-code4 min
VS Code for Beginners: Installation and First Setup
Download VS Code from the official site, open a project folder rather than single files, learn the Command Palette and the built-in terminal, turn on Settings Sync, and change a handful of settings such as auto save and format on save.
Basics - IT by industry3 min
Property Management Software for Rentals: Rent, Tenants, Repairs
Property management software stores leases and tenants, invoices rent and sends reminders automatically, takes repair requests and shows owners income and expenses for each property.
Basics - IT for business4 min
How to Get Employees to Actually Use New Software
People use a new system when it solves their own tasks, they were consulted early, trained on real scenarios and the old workarounds are phased out. Success is measured by how much work actually flows through the system, not by the launch date.
Practice - Web development4 min
Semantic HTML: Which Tags to Use and Why It Matters
Semantic HTML means choosing tags by what content is (header, nav, main, article, button), not by how it looks, so screen readers, search engines and developers understand the page.
Basics - SEO4 min
SEO Audit Checklist: How to Audit a Website Step by Step
An SEO audit goes top-down: first check that search engines can see your pages, then technical health, on-page, content, links and local presence, and sort fixes by impact and effort.
Practice - DevOps4 min
How to Reduce Docker Image Size: Practical Techniques
The biggest wins come from multi-stage builds and a lean base image (slim, alpine or distroless); then clean package caches in the same layer, add a .dockerignore and inspect layers with dive.
Practice - AI & automation3 min
Prompt Injection: How Attacks Work and How to Defend
Prompt injection is when malicious text in a request or in data makes the model break your instructions; it cannot be fully eliminated, so defense is layered: least privilege, isolation of untrusted data, output checks and human approval for risky actions.
Advanced - Programming4 min
Sorting Algorithms Compared: Bubble, Merge, Quick and More
Simple sorts (bubble, insertion) run in O(n²) and suit tiny arrays, while merge, quick and heap sort run in O(n log n); in real code your language's built-in sort is almost always the right choice.
Basics - Mobile development4 min
Third-Party SDKs in Mobile Apps: Benefits, Risks and Hidden Costs
Third-party SDKs save months of work, but each one adds size and startup time, collects data you are responsible for, and can crash your app, so choose them deliberately and review them regularly.
Basics - Marketing & analytics4 min
What Is Affiliate Marketing and How Partner Programs Work
Affiliate marketing means outside partners bring you customers and you pay only for results such as a lead, sale or install, tracked through links, promo codes and postbacks.
Basics - Design & UX4 min
What Is Information Architecture in UX
Information architecture is how a product's content is grouped, named and connected, and good IA lets people find what they need without having to think about where it is.
Basics - E-commerce & CRM4 min
What Is 3D Secure and How It Affects Checkout Conversion
3D Secure is an extra check by the card-issuing bank that confirms the buyer really owns the card; it shifts fraud liability from the store to the bank, and with 3DS2 most honest buyers pass it silently without any extra step.
Basics - Security4 min
What Is Penetration Testing and How It Is Done
A penetration test is an authorized, simulated attack in which specialists try to break into your system within an agreed scope, then hand over a report with proven vulnerabilities, their impact and how to fix them.
Basics - Databases & data4 min
What Is MongoDB and When Should You Use It
MongoDB is a document NoSQL database that stores data as JSON-like documents in collections without a rigid schema. It is handy for flexible and nested data, while linked financial and accounting data is usually safer in a relational database.
Basics - IT careers3 min
Who Is a Fullstack Developer and Is It Worth Becoming One
A fullstack developer builds both the interface and the server side of an app on their own; this pays off in startups and small teams, while specialists usually win in complex systems.
Basics - Tools & no-code4 min
VS Code Shortcuts and Tricks to Code Faster
Most of the speed in VS Code comes from five habits: using the command palette instead of menus, jumping to files and symbols from the keyboard, multi-cursor editing, refactoring with F2 and Ctrl+., and your own snippets and keybindings.
Practice - IT by industry4 min
QR Code Menu for a Restaurant: How to Set It Up
If you only want to replace the paper menu, a static web page behind a QR code is enough; for ordering and paying from the table you need an interactive menu connected to your POS, otherwise the kitchen and the till live in separate worlds.
Practice - IT for business4 min
Software Development Contract: Clauses to Check
The clauses that matter most are a clearly defined scope, milestone payments tied to acceptance, transfer of IP rights to the code, and clear warranty and termination terms.
Practice - Web development4 min
Session vs JWT: How to Implement Login in Web Apps
For a typical web app, server-side sessions in an httpOnly cookie are the safe default; JWT with refresh tokens makes sense for mobile clients, multiple services and external APIs.
Practice - SEO4 min
SEO for Medical Clinics: How to Attract Patients From Search
Search engines judge medical sites more strictly than any others, so a clinic needs proof of expertise — doctor authors, licences, sources — a separate page for every service and doctor, map listings for each branch and correct structured data.
Practice - DevOps4 min
How to Prepare a Web App for Traffic Spikes
Find the bottleneck with a load test, take pressure off the database with caching and connection pooling, move heavy work to queues, set up autoscaling and decide in advance which features you can switch off.
Advanced - AI & automation3 min
RAG Evaluation Metrics: Recall, Faithfulness and Relevance
Evaluate RAG in two layers: retrieval metrics (recall@k, MRR) show whether the right context was found, and generation metrics (faithfulness, answer relevance) show whether the model used it correctly. The split tells you immediately where to look.
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