Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- Databases & data4 min
SQL Basics: SELECT, WHERE, ORDER BY and LIMIT
Almost every read query follows the pattern SELECT columns FROM table WHERE condition ORDER BY sorting LIMIT count. Learn these five parts plus LIKE, IN and IS NULL, and you can pull most of the data you need from a database.
Basics - Hosting & cloud4 min
What Is a PTR Record (Reverse DNS) and When You Need One
A PTR record maps an IP address back to a hostname; you need one mainly when a server sends email, and it is set by whoever owns the IP — your VPS or cloud provider — not at your domain registrar.
Basics - IT careers4 min
How to Practice Algorithms for Interviews: A LeetCode Strategy
Solve problems by pattern, not at random: learn the pattern's idea, do 5-10 problems on it, keep an error log and revisit unsolved ones after a few days; the goal is recognizing patterns, not remembering answers.
Practice - Tools & no-code4 min
How to Run Project Management in Notion
Project management in Notion runs on three linked databases — Projects, Tasks and Sprints — with clear statuses, owners and dates; a timeline and dashboards sit on top, while complex engineering processes are better served by a dedicated tracker.
Practice - IT by industry4 min
Interactive Apartment Chessboard for Developer Websites
An apartment chessboard is a grid of all units by floor and section with live status from the CRM; combined with floor plans, filters and online booking, it lets buyers find and reserve a specific apartment without waiting for a sales manager.
Practice - Networks & office IT4 min
Echo, Delays and Dropped VoIP Calls: Causes and Fixes
Most VoIP problems are network problems: packet loss and jitter cause robotic, choppy audio, SIP ALG and NAT timeouts cause one-way audio and drops, and echo usually comes from a headset or speakerphone. Disable SIP ALG, enable QoS and keep-alive, use cable.
Practice - IT for business4 min
How to Structure Milestone Payments in a Software Project
A reliable setup is a modest prepayment to start, then a payment for each milestone after a specific deliverable is accepted against agreed criteria. That way neither the client nor the contractor carries the risk of the whole project at once.
Practice - Web development4 min
Data Fetching and Caching in Next.js: A Practical Deep Dive
In Next.js you decide what gets cached and for how long: refresh data on a timer or by tag after a change, and stream dynamic parts with Suspense. Stale data almost always means a page or request was cached when you did not expect it.
Advanced - SEO3 min
Local SEO for Multi-Location Businesses
Each branch needs its own unique page on your site, its own Google and Yandex Maps listing with identical details, separate LocalBusiness markup and steady review management — with no templated duplicates.
Advanced - DevOps4 min
Kubernetes Pods, Deployments and Services Explained
A Pod is a running container, a Deployment keeps the right number of Pods running and updates them without downtime, and a Service gives them a stable address. Labels and selectors tie them together.
Basics - AI & automation3 min
How to Use ChatGPT at Work: Tasks Worth Delegating to AI
ChatGPT is good at drafting emails, structuring reports, writing spreadsheet formulas and first-pass research, but a person always checks facts, figures, names and anything that goes to a client.
Practice - Programming5 min
Luhn Algorithm: Validating Uzcard, Humo and Visa Card Numbers
The Luhn algorithm is a simple checksum that catches most typos in a card number before the form is submitted; it cannot tell whether a card exists — only the payment provider can.
Practice - Mobile development3 min
Mobile App Monetization Models: Ads, Subscriptions, Freemium and More
Pick a monetization model based on how often and why people open your app: frequent free use suits ads, ongoing value suits subscriptions, one-off value suits purchases. Models can be combined as long as the paid tier removes friction instead of breaking the free experience.
Basics - Marketing & analytics4 min
Marketing Mix Modeling: How MMM Measures Channel Impact
MMM is a statistical model that uses weekly channel spend and sales over a long period to estimate how much of your sales each channel drove, accounting for delayed ad effects, saturation and external factors.
Advanced - Design & UX4 min
Designing for Cyrillic and Latin: Multilingual Typography
Choose a typeface with full Cyrillic support, including extended Cyrillic, test Uzbek o‘, g‘ and the apostrophe in it, design for the longest language without fixed widths, and test layouts with real translations rather than an English draft.
Practice - Telegram & messengers4 min
How Games Work in Telegram: Games API vs Mini App Games
The Games API is a simple legacy way to run an HTML5 game with an in-chat high score table, while a Mini App adds full screen, verified user data, Stars payments and sharing; new projects almost always choose a Mini App.
Basics - E-commerce & CRM4 min
How Much Does an Online Store Cost and What Drives the Price
The price of a store depends on the amount of logic, not the number of pages: catalog size and complexity, design approach, the number of integrations (1C, payments, delivery, CRM), custom features and the cost of ownership after launch; the most accurate budget starts from a feature list split into must-haves and later items.
Practice - Security4 min
Secure File Uploads: A Checklist for Developers
An uploaded file is untrusted data that must never be executed or served as is. Validate type by allowlist and file signature, limit size, rename it, store it outside the web root, re-encode images and scan for malware.
Practice - Databases & data3 min
SQL GROUP BY, HAVING and Aggregate Functions
GROUP BY collects rows into groups, aggregate functions compute one value per group, WHERE filters rows before grouping and HAVING filters the finished groups.
Practice - Hosting & cloud4 min
Direct File Uploads to Object Storage with Presigned URLs
Your server hands the browser a short-lived signed link and the file goes straight to storage, bypassing the backend; size and type limits live in the signature (best via presigned POST), and CORS allows uploads only from your domain.
Advanced - IT careers4 min
LinkedIn Profile for IT Jobs: How to Get Noticed by Recruiters
Recruiters search LinkedIn by role, skills and location, so put those words in your headline, About, skills and experience, turn on Open to work and keep a minimal level of activity.
Practice - Tools & no-code4 min
Notion vs Confluence: Which Knowledge Base to Choose
If your team lives in Jira and needs strict permissions and scale, choose Confluence; if you want one flexible space for docs, tasks and databases without tying yourself to Atlassian, choose Notion.
Basics - IT by industry4 min
Kindergarten Management Software: Attendance, Payments, Parents
Kindergarten software combines child check-in and check-out, daily reports and menus for parents, automatic fee calculation that accounts for absences, and staff schedules; choose it by ease of use for staff and parents, tariff flexibility and integrations.
Basics - Networks & office IT4 min
What Is a Business VPN and How It Works
A business VPN creates an encrypted tunnel over the internet through which an employee or branch office securely reaches the company's internal resources as if they were in the office.
Basics
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