Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- Databases & data4 min
PostgreSQL JSONB: When and How to Store JSON in a Table
Store JSON in a jsonb column, index it with GIN and use it for truly flexible data such as product attributes and raw webhooks; anything you filter on, join on or count money with belongs in regular columns.
Practice - Hosting & cloud4 min
How to Estimate Cloud Hosting Costs Before You Launch
Do not price a server — price every component of the system in the units the provider bills: hours, gigabytes, requests. Enter them into the official calculator, include traffic, storage and backups, and add a buffer for growth and unknowns.
Practice - IT careers4 min
How to Start a Career in Cybersecurity: Roles and First Steps
Start with the foundation — networking, Linux, how the web works and scripting — then pick a direction (SOC, pentesting, AppSec or GRC) and build practice on legal platforms such as CTFs and training labs.
Basics - Tools & no-code4 min
Linear vs Jira: Which Issue Tracker Fits a Startup
A small product team is usually faster and happier in Linear with its built-in workflow and cycles; Jira wins once there are many teams, complex processes and a need for detailed reports and permissions.
Basics - IT by industry3 min
GPS Fleet Tracking: How It Works and What It Saves
GPS fleet tracking is a device in each vehicle that sends location and sensor data to a server, so you see vehicles on a map and get reports. Savings come from catching extra mileage, engine idling and unauthorized trips.
Basics - Networks & office IT4 min
RAID Levels Explained: RAID 0, 1, 5, 6 and 10
RAID combines several drives into one array for speed or to survive a drive failure: RAID 1 and 10 mirror, RAID 5 and 6 use parity, RAID 0 only adds speed — and no level replaces a backup.
Basics - IT for business3 min
How to Switch Development Vendors Mid-Project
First bring every account and the source code under your control, then order an independent audit, and only then hand the project to a new team with a period of overlap and a rollback plan.
Practice - Web development4 min
Browser Caching: Cache-Control, ETag and Cache Busting
Cache hashed static files for a year with immutable and serve HTML with no-cache plus an ETag, so users get updates immediately while repeat visits stay almost instant.
Practice - SEO3 min
How to Improve LCP: Speeding Up the Largest Contentful Paint
Find the LCP element, see which of its four phases takes the most time and fix that one: speed up the server, remove render-blocking resources, give the main image high priority and never lazy-load it.
Practice - DevOps3 min
Helm Charts Guide: Packaging Kubernetes Applications
Helm is a package manager for Kubernetes: a chart combines manifest templates with settings in values.yaml, and install, upgrade and rollback manage versions of the installed app as releases.
Practice - AI & automation4 min
Few-Shot Prompting: How to Teach an LLM With Examples
Few-shot prompting means putting a few "input → output" pairs directly into the prompt so the model follows the shown format and logic without retraining. Two to five varied, clearly formatted examples that cover typical and edge cases usually work best.
Practice - Programming4 min
How Garbage Collection Works in Java, Go and JavaScript
A garbage collector frees objects the program can no longer reach through references; leaks happen when an unneeded object is still reachable, for example from a cache or a subscription.
Advanced - Mobile development4 min
Material Design 3 for Android Apps: Core Principles
Material Design 3 is Google's design system for Android: colors are defined as roles and can adapt to the user's wallpaper, navigation depends on screen width, depth is shown through surface tone, and a brand style sits on top of the system without breaking its behavior.
Basics - Marketing & analytics4 min
How to Set Up a Google Ads Search Campaign Step by Step
Set up conversion tracking first, then group intent-based keywords into tight ad groups with matching landing pages, write responsive search ads with assets, restrict locations and networks, and pick a bid strategy that fits how much data you have.
Practice - Design & UX4 min
How to Run a Usability Test: Step-by-Step Guide
A usability test means real users complete typical tasks in your interface while you quietly watch where they struggle. You need four to six well-matched participants, scenario-based tasks, a neutral moderator and a findings list ranked by frequency and severity.
Practice - Telegram & messengers4 min
How to Build a Telegram Bot in Python with aiogram 3
In aiogram 3 a bot is made of a Bot (talks to the API), a Dispatcher (receives updates) and Routers whose handlers fire when filters match; keyboards are attached to replies and start_polling runs it.
Practice - E-commerce & CRM4 min
How to Reduce Cart Abandonment in an Online Store
Cart abandonment drops when buyers see the full cost upfront, can purchase without registering and pay with a familiar method, while those who still leave are brought back with polite reminders by email, Telegram or push.
Practice - Security4 min
How to Prevent SQL Injection: Parameterized Queries and ORMs
Parameterized queries prevent SQL injection: the query text and the data reach the database separately, so input can never become a command. Take column names from an allowlist and run the app as a least-privilege database user.
Practice - Databases & data4 min
PostgreSQL Point-in-Time Recovery with WAL Archiving
Point-in-time recovery restores a base backup and then replays archived WAL files up to a chosen moment, so you can return the database to the second before a bad DELETE; it requires continuous WAL archiving and regular restore tests.
Advanced - Hosting & cloud4 min
How to Register a .uz Domain: Requirements and Steps
A .uz domain is registered only through an accredited registrar: check the name is free, submit an application with accurate owner details, point it to working DNS servers, pay, and then renew on time.
Practice - IT careers4 min
How to Start Freelancing as a Developer or Designer
Pick a narrow niche, build 2-3 strong case studies, start with platforms or your network, work only under written terms with an upfront payment, and set up a legal way to get paid before the first order.
Practice - Tools & no-code4 min
Error Handling in Make: Retries, Break, Rollback and Ignore
In Make you attach an error handler route to a module and end it with a directive; for flaky APIs use Break with automatic retries and stored incomplete executions, and put an alert before the directive.
Advanced - IT by industry4 min
Greenhouse Automation: Climate Control Systems Explained
A climate control system measures air, substrate and light with sensors, and a controller follows set rules to run vents, heating, fogging, grow lights and fertigation — all visible and adjustable from a phone.
Basics - Networks & office IT4 min
Remote Access to Office Computers: RDP, VPN or Remote Desktop Apps
For everyday employee work, RDP over VPN or an RDP gateway with 2FA is the safest choice; remote desktop apps suit one-off support; an RDP port open to the internet is never acceptable.
Practice
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