Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- Mobile development4 min
Android Fragmentation: Choosing Min OS Version and Test Devices
Pick the minimum Android version from your own audience data by weighing lost users against the cost of supporting old versions, then test on a small matrix: oldest and newest versions, popular models, a low-end device and different vendor skins.
Basics - Marketing & analytics4 min
How to Write Ad Copy That Gets Clicks: Formulas and Examples
Ads get clicks when the first line names a concrete benefit or pain, there is a clear offer and call to action, and the landing page keeps the same promise; pick winners by testing, not by taste.
Practice - Design & UX4 min
Accessibility in Design: Basics Every Designer Should Know
Accessible design means an interface people can use with low vision, color blindness, without a mouse or with a screen reader. The designer's foundation: enough contrast, readable text, visible focus, meaning beyond color, alt text and a clear structure.
Basics - Telegram & messengers4 min
aiogram 3 Project Architecture: Routers, Middlewares and DI
Split handlers into routers by feature, keep business logic in services, give handlers a DB session and services through a middleware, and handlers stay thin and easy to test.
Advanced - E-commerce & CRM4 min
ABC and XYZ Analysis: How to Classify Inventory and Plan Stock
ABC ranks products by revenue contribution, XYZ by demand stability; together they show which items to always keep in stock, which to order on demand and which to drop.
Practice - Security5 min
API Security Best Practices: A Developer Checklist
Secure an API by authenticating every request, checking on the server that the user may access each specific object and field, validating input against strict schemas, limiting request volume and logging security events.
Practice - Databases & data4 min
Change Data Capture (CDC) with Debezium Explained
Log-based CDC reads the database transaction log and turns every insert, update and delete into an event; Debezium does this for PostgreSQL, MySQL and others and publishes the events to Kafka, keeping warehouses, search indexes and caches in sync within seconds instead of after the next batch job.
Advanced - Hosting & cloud4 min
AWS Free Tier: What Is Free and How to Avoid Surprise Bills
The AWS Free Tier covers limited usage of specific services, not your whole account: anything beyond the limits and many supporting resources are billed. The fix is simple — a budget with alerts on day one and a regular look at the Billing console.
Practice - IT careers3 min
Backend Developer Roadmap: A Practical Learning Path
Learn backend in this order: one language and its ecosystem, SQL and databases, REST APIs, authentication, testing and deployment basics, proving each skill with a project that uses it.
Practice - Tools & no-code5 min
Async Communication in Teams: Tools and Rules
Put context and decisions in documents, discuss them in chat threads, show complex things in short videos, and agree on response times, and most status meetings become unnecessary.
Practice - IT by industry4 min
Client Portal for an Accounting Firm: Documents and Requests
A client portal replaces messenger chaos with one secure place where clients upload documents, track requests and receive reports, while accountants see the full picture for every client.
Practice - Networks & office IT4 min
Guest Wi-Fi with a Captive Portal for Cafes, Hotels and Clinics
A captive portal is the page guests see before getting online, where they log in by SMS, voucher or a button, accept the terms and give consent; pick the login method that local law requires, limit sessions and keep the guest network separate from the work one.
Practice - IT for business3 min
Bootstrapping vs Venture Funding for a Tech Startup
Bootstrapping means growing on your own money and revenue: more control, but slower and with less margin for error. Venture money speeds up growth but costs equity and demands a very large market; the choice depends on market size, competitor speed and your goals.
Basics - Web development4 min
Astro vs Next.js for Content Sites, Blogs and Landing Pages
If a site is mostly text and pages, Astro ships minimal JavaScript and loads fast out of the box; if it contains a lot of interactivity, user accounts and logic, Next.js is the better fit.
Basics - SEO4 min
What Is Anchor Text and How to Use It for SEO
Anchor text is the clickable text of a link that tells search engines what the target page is about; a natural profile is dominated by branded, URL and descriptive anchors, while a pile of exact-match commercial anchors is a classic spam signal for Google and Yandex.
Basics - DevOps4 min
Blue-Green vs Canary Deployment: Strategies Compared
Blue-green switches all traffic at once between two full environments — instant rollback, but double infrastructure. Canary moves traffic to the new version gradually — lower risk, but it needs per-version metrics and automated analysis.
Advanced - AI & automation4 min
AI Chatbot Launch Checklist: What to Verify Before Going Live
Before launch, run the bot through real and tricky questions, check refusals and human handoff, enable logging, tell users how their data is processed and set up monitoring.
Practice - Programming4 min
Binary Search: How It Works and How to Implement It
Binary search finds an element in sorted data in O(log n) by discarding half the range at each step; the key is to define your bounds and loop condition precisely to avoid off-by-one errors.
Practice - Mobile development4 min
APK vs AAB: Android App Formats Explained
An APK is the package that gets installed on a device, while an AAB is a publishing format: Google Play builds lighter, device-specific APKs from it and signs them with the app signing key.
Basics - Marketing & analytics4 min
Why Ads, GA4 and CRM Numbers Don't Match: Discrepancies Explained
Ad platforms, GA4 and the CRM count different events under different attribution rules, windows, time zones and data completeness, so they will never match exactly; the job is to explain the gaps and pick a source of truth for each metric.
Advanced - Design & UX4 min
How to Design App Onboarding That Users Finish
The best onboarding is the shortest path to a first useful result: instead of a slide carousel, let people do the main action right away, teach in context, and request permissions at the moment their benefit is obvious.
Practice - Telegram & messengers4 min
FSM in aiogram: How to Build Multi-Step Forms in a Bot
FSM in aiogram remembers which step of a form the user is on: you list the steps in a StatesGroup, attach handlers to states, collect answers with update_data and keep it all in Redis so nothing is lost on restart.
Practice - E-commerce & CRM4 min
Amazon FBA vs FBM: Which Fulfillment Method Is Right for You
With FBA, Amazon stores, ships and serves orders and you get Prime, but you pay storage fees and carry inventory risk; with FBM you or your warehouse do the work, with more control and fewer fees but a heavier workload. Sellers from abroad usually go with FBA or FBM through a 3PL in the target country.
Practice - Security4 min
Backup Strategy for a Small Business: What, How Often, Where
First decide how much data and downtime you can afford to lose (RPO and RTO), then list every system, automate backups following the 3-2-1 rule, and test restores on a schedule.
Practice
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