Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- Databases & data4 min
SQL vs NoSQL: Differences and When to Use Each
SQL databases store data in related tables with a strict schema and reliable transactions, while NoSQL stores documents, key-value pairs, columns or graphs with a more flexible structure. Most business apps should start with SQL and add NoSQL for a specific job.
Basics - Hosting & cloud4 min
How to Monitor Website Uptime and Get Downtime Alerts
Use an external uptime service that checks your site from several regions every 1–5 minutes, alerts Telegram or email after 2–3 failed checks in a row, and hosts a public status page.
Practice - IT careers3 min
QA Engineer Roadmap: From Manual Testing to Automation
Start with manual testing: theory, test cases, bug reports, DevTools, APIs and SQL; then learn one programming language, an automation framework and running tests in CI, building a portfolio at every stage.
Practice - Tools & no-code4 min
How to Find and Remove Duplicates in Excel and Google Sheets
Copy your data first and highlight repeats with conditional formatting, then remove them with the built-in tool or build a clean list with the UNIQUE formula without touching the original.
Basics - IT by industry4 min
How to Manage a Retail Chain From One System
A chain runs from one system when the catalog, prices and rules are set centrally, each store works as a separate warehouse with clear permissions, and the rollout goes one location at a time.
Practice - Networks & office IT3 min
What Is a Network Firewall and How It Protects an Office
A firewall decides which traffic may enter and leave the office network based on rules; for a small office the foundation is blocking all inbound connections by default and allowing remote access only through a VPN.
Basics - IT for business3 min
Outstaffing vs Outsourcing: What's the Difference
With outsourcing you buy a result, and the contractor is responsible for deadlines and quality. With outstaffing you get people for your own team and manage them yourself, which works if you already have a tech lead.
Basics - Web development4 min
package.json Explained: Dependencies, Scripts and Semver
package.json is the passport of a JavaScript project: it lists the name, scripts and dependencies with version ranges, while the lock file pins exact versions so every install builds the same thing.
Basics - SEO3 min
Nofollow, Sponsored and UGC Links: When to Use Each
Use sponsored for paid and advertising links, ugc for links in comments and forums, and nofollow for any other link you do not vouch for. Regular editorial links need no attribute at all.
Basics - DevOps4 min
Load Testing with k6: How to Find Your App's Limits
Write a k6 script that repeats real user actions, ramp load up in stages with clear thresholds for p95 latency and errors, watch server metrics in parallel, and fix the first bottleneck you find before testing again.
Practice - AI & automation4 min
LangChain vs LlamaIndex: Do You Need an LLM Framework
For a chatbot, extraction or a simple RAG, the provider's SDK plus your own code is often enough; LlamaIndex pays off for document-heavy RAG, LangChain for many integrations and agent workflows, but each adds abstractions you have to learn and maintain.
Practice - Programming3 min
Python asyncio Explained: async, await and the Event Loop
asyncio lets one thread handle many I/O operations while they wait for the network or disk; it does not speed up CPU-bound work — use processes for that.
Advanced - Mobile development4 min
Common Mobile UX Mistakes and How to Avoid Them
Most mobile UX problems come down to tiny touch targets, hidden navigation, sign-up before users see value, unclear errors and ignoring the thumb and the keyboard. Each one has a simple fix once you design for a real hand on a real screen.
Practice - Marketing & analytics4 min
Performance Marketing vs Brand Marketing: Key Differences
Performance marketing delivers measurable leads and sales now, while brand marketing makes people know and choose you later. A growing business needs both: performance pays the bills today, brand lowers the cost of sales tomorrow.
Basics - Design & UX4 min
Types of Logos: Wordmark, Symbol, Emblem and More
Logos fall into wordmarks, lettermarks, pictorial marks, abstract marks, mascots, emblems and combination marks, and a new business is usually best served by a wordmark or combination mark because nobody knows its name yet.
Basics - Telegram & messengers4 min
How to Build a Telegram Support Bot with Operator Handoff
The bot first resolves common questions through an FAQ; when it cannot, it opens a ticket and routes the conversation to a staff group with a separate topic per customer or to a helpdesk, then copies the operator's reply back, so the customer only ever talks to the bot.
Practice - E-commerce & CRM4 min
Handling Payment Webhooks Reliably: Idempotency and Retries
A reliable webhook handler verifies the signature, stores each event by its unique ID, changes order status only through allowed transitions and regularly reconciles with the provider API.
Advanced - Security4 min
How to Secure SSH on a Linux Server
Secure SSH means key-only login as a dedicated sudo user, root and password login disabled, fail2ban against brute force, a firewall that limits who can connect, and regular log review. For critical servers, add a second factor such as a hardware security key.
Practice - Databases & data4 min
SQL Window Functions: ROW_NUMBER, RANK, LAG and More
A window function computes a value over a set of related rows but, unlike GROUP BY, does not collapse them: every row stays in the result and gets a number, rank, running sum or a neighboring row's value.
Practice - Hosting & cloud4 min
What Is a Domain Name: Zones, Registrars and Ownership
A domain name is a human-friendly site address that you lease from a registry through a registrar; register it to your own company, because legally it belongs to whoever is listed as the owner.
Basics - IT careers4 min
Questions to Ask the Interviewer at the End of an IT Interview
At the end of an interview ask 3-5 questions about the team, processes, code, onboarding and growth: concrete answers with examples are a good sign, vague and generic ones are a reason to be careful.
Practice - Tools & no-code4 min
How to Build a Simple CRM in Google Sheets
A working CRM in Google Sheets is one lead table with fixed columns, status dropdowns, a next-contact date highlighted when due, a dashboard sheet with COUNTIFS and careful access rights; move to a real CRM when the team grows and integrations become necessary.
Practice - IT by industry4 min
MES vs ERP: What a Factory Needs and When
ERP plans and accounts for company resources over weeks and months, while MES runs shop floor execution by shifts and minutes; a growing plant usually needs ERP first and MES once the shop floor becomes the bottleneck.
Basics - Networks & office IT4 min
What Is PoE (Power over Ethernet) and Which Devices Need It
PoE (Power over Ethernet) lets a device receive both data and electrical power over a single twisted-pair cable, so IP cameras, phones and access points don't need a separate power outlet.
Basics
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