Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- IT for business3 min
Questions to Ask a Development Agency Before Signing
Before signing, ask the agency about process, team, code ownership, testing, support and how the price is built. Good answers are specific, avoid "we will handle everything" and come with a willingness to put them in the contract.
Practice - Web development4 min
React Server Components Explained: How They Work and Why
Server Components run only on the server and never ship to the browser bundle; interactive parts go into Client Components marked "use client", and only serializable data crosses between them.
Advanced - SEO4 min
Why Pages Are Not Indexed by Google and How to Fix It
A page stays out of the index either because of a technical block (noindex, robots, canonical, errors) or because the search engine does not see enough value in it; the first is fixed with settings, the second with better content and internal links.
Practice - DevOps4 min
Nginx Proxy Cache: How to Cache Backend Responses
Declare a cache zone with proxy_cache_path, enable proxy_cache and proxy_cache_valid, exclude logged-in users with proxy_cache_bypass and proxy_no_cache, and use proxy_cache_use_stale to keep the site up when the backend fails.
Practice - AI & automation4 min
LLM Observability: Tracing, Logging and Monitoring AI Apps
Log every LLM call with its prompt version, inputs, outputs, tool calls, tokens, latency and cost, link the steps into one trace, watch quality over time, and mask personal data before it is stored.
Advanced - Programming3 min
Python vs JavaScript: Which Language to Learn First
If you want to build websites and interfaces, start with JavaScript; if you care about automation, data, AI or bots, start with Python. Both suit beginners — your goal decides, not which one is "better".
Basics - Mobile development4 min
How to Accept Payme and Click Payments in a Mobile App
The app only starts the payment; the order is confirmed by your backend after a server-to-server callback from Payme or Click. Web checkout is the fastest start, SDKs and card tokens give a smoother UX.
Practice - Marketing & analytics4 min
SMS Marketing: How It Works and When It Pays Off
SMS marketing pays off when messages are short, timely and sent to people who opted in; measure target actions from SMS links and promo codes, not delivery.
Basics - Design & UX4 min
UX Metrics: SUS, Task Success and How to Measure UX
Usability is measured with behavioral metrics (task success, time, errors) and perception metrics (SEQ after each task, SUS at the end of a session). You can compare iterations only when tasks, success criteria and participants stay comparable.
Advanced - Telegram & messengers4 min
How to Validate initData in Telegram Mini Apps on the Backend
Send the raw initData string to your server, recompute HMAC-SHA-256 with a key derived from the bot token and the string WebAppData, compare it with hash and check auth_date — never trust initDataUnsafe.
Advanced - E-commerce & CRM4 min
Product Recommendations in E-commerce: How They Work
Recommendations grow from simple rules to models built on behavior and embeddings; they belong on product pages, carts and emails, and their value is proven only by an A/B test on revenue per visitor.
Advanced - Security4 min
How to Verify Webhook Signatures with HMAC and Prevent Spoofing
Recompute the HMAC of the raw request body (and timestamp) with your shared secret, compare it to the signature in constant time, reject old timestamps and repeated event IDs, and only then trust and process the webhook.
Practice - Databases & data4 min
What Is a Data Warehouse and Why Businesses Need One
A data warehouse (DWH) is a separate database for analytics that regularly pulls in data from your CRM, accounting, website and ads, so every business question is answered from the same verified numbers.
Basics - Hosting & cloud3 min
What Is an SSL Certificate: DV, OV and EV Types
An SSL certificate proves a site belongs to whoever controls the domain and enables HTTPS encryption; DV checks only domain control, OV and EV also verify the organization, and encryption is identical across all three, so most sites need only DV.
Basics - IT careers3 min
Switching to IT After 30: Realistic Paths and Pitfalls
Switching to IT after 30 is realistic if you build on your past experience, choose a role close to your previous field and plan a financial cushion and study time in advance.
Basics - Tools & no-code4 min
Tilda Website Launch Checklist
Before launching a Tilda site, connect your domain with HTTPS, fill in the favicon and meta tags for every page, link forms to receivers and send a test lead, install analytics, check mobile and speed, and assign a 404 page.
Practice - IT by industry4 min
What Is OEE and How to Track Equipment Efficiency Automatically
OEE (Overall Equipment Effectiveness) multiplies availability, performance and quality to show what share of planned time a machine actually produced good parts; automatic collection from machines plus clear downtime reasons turns it into a daily improvement tool.
Practice - Networks & office IT4 min
2.4 GHz vs 5 GHz vs 6 GHz Wi-Fi: Which Band to Use
Use 5 GHz as the default for work devices, keep 2.4 GHz for range and older or simple devices, and add 6 GHz for the newest devices in busy spaces; usually one staff SSID across bands is better than one per band.
Basics - IT for business4 min
Monthly Costs After Launching a Website or App
After launch you keep paying for the domain, hosting, store accounts, third-party APIs (SMS, email, maps, AI), payment fees, monitoring and support hours; some costs are fixed, others grow with your user base.
Practice - Web development3 min
React State Management: Context vs Redux vs Zustand
First separate server data (give it to TanStack Query) from client state; Context is enough for rarely changing globals, Zustand for frequent updates, Redux Toolkit for large teams that need strict rules.
Practice - SEO3 min
Programmatic SEO: Generating Thousands of Pages Safely
Programmatic SEO is a template plus a database where every page answers a real query with unique data; if pages differ only by a swapped-in word, you are heading for low-value content filters.
Advanced - DevOps3 min
How to Set Up Nginx as a Reverse Proxy
Nginx becomes a reverse proxy through the proxy_pass directive in a location block; you add Host and X-Forwarded-* headers, WebSocket support and sensible timeouts, then validate the config with nginx -t.
Practice - AI & automation4 min
LLM Quantization Explained: 8-bit, 4-bit, GGUF and Quality Loss
Quantization stores model weights with fewer bits, cutting memory and often speeding up inference; 8-bit is usually close to the original, 4-bit is a practical compromise, and the only reliable quality check is testing on your own data.
Advanced - Programming4 min
Race Conditions and Deadlocks: Causes and How to Prevent Them
A race condition happens when threads change shared data without synchronization; a deadlock happens when threads wait on each other's resources in a cycle. Fix them with synchronization, a consistent lock order and less shared mutable state.
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