Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- Mobile development4 min
Background Work on iOS and Android: Limits and Reliable Patterns
Neither OS guarantees exact timing for background work, so reliable sync relies on system schedulers, OS-managed background transfers, idempotent operations and a catch-up sync every time the app opens.
Advanced - Marketing & analytics5 min
What Is a Customer Journey Map and How to Build One
A CJM is a table showing the customer's path from first noticing a problem to buying again: stages, touchpoints, questions and pains. Empty or painful cells become your marketing task list.
Basics - Design & UX4 min
Customer Journey Map: What It Is and How to Build One
A customer journey map (CJM) is a visual of everything a customer goes through to reach a goal with your product: stages, actions, touchpoints, thoughts, emotions and pain points. Its purpose is to show where the experience breaks so the team knows what to fix first.
Basics - Telegram & messengers3 min
How to Deploy a Telegram Bot on a VPS with a Webhook
A webhook bot needs a public HTTPS address: nginx with a certificate receives Telegram's requests and proxies them to the app, which runs as a systemd service and checks the secret token header.
Practice - E-commerce & CRM4 min
Checkout UX Checklist: How to Design a Checkout That Converts
A checkout that converts offers guest checkout, asks for as few fields as possible, shows the full total including delivery before payment, supports familiar payment methods, explains errors clearly and is easy to complete on a phone.
Practice - Security4 min
How to Protect a Website from DDoS Attacks
Put your site behind a traffic filtering service such as Cloudflare, hide the real server IP and allow traffic only from that service, cache everything you can, and prepare an attack response plan in advance.
Practice - Databases & data4 min
How to Add Full-Text Search to a Site with Elasticsearch
Create an index with separate fields per language and proper analyzers, keep it in sync with your main database through events or periodic reindexing, and use fuzziness plus search_as_you_type for typos and autocomplete.
Practice - Hosting & cloud4 min
Cloudflare Proxied vs DNS-Only: When to Use the Orange Cloud
Proxy (orange cloud) your website's HTTP traffic to hide the server IP and get caching, WAF and DDoS protection; keep mail, SSH, databases and other non-HTTP services DNS-only, and set the SSL mode to Full (strict).
Practice - IT careers3 min
DevOps Engineer Roadmap: Skills to Learn Step by Step
Learn DevOps from the ground up: Linux and networking, then scripting and Git, containers, CI/CD, cloud and infrastructure as code, and monitoring, reinforcing each step with a lab on your own virtual machines.
Practice - Tools & no-code4 min
LET and LAMBDA in Excel: Custom Functions Without VBA
LET names intermediate values inside a formula, and LAMBDA turns a formula into your own function that you save by name and call like SUM — no macros or VBA required.
Advanced - IT by industry4 min
Citizen Appeals Management: How Requests Are Processed Online
A citizen appeals system collects requests from every channel into one registry, routes them to the right department, tracks the required deadlines, notifies the applicant at each status change and shows which problems recur most.
Basics - Networks & office IT4 min
How to Organize Shared Folders and Access Rights on a File Server
Build a shallow folder tree by department, grant rights only to groups (never to individual users) at the top levels, give everyone the minimum access they need, and protect data with snapshots.
Practice - IT for business4 min
Education Center Automation: Enrollment, Payments, Schedules
A training center needs a CRM where a lead becomes a student in a group with a schedule, attendance and a payment plan, while a Telegram bot automatically tells students and parents about classes, absences and dues.
Practice - Web development3 min
CORS Explained: Why the Error Happens and How to Fix It
A CORS error comes from the browser, not the server, and it is fixed on the server, which must explicitly allow your origin with the right headers instead of disabling protection.
Practice - SEO3 min
Duplicate Content: What It Is and How It Hurts SEO
Duplicate content is the same or nearly identical content at different URLs. It confuses search engines about which page to rank, splits link signals and wastes crawl resources; fix it with 301 redirects, rel=canonical and proper parameter handling.
Basics - DevOps3 min
Dev, Staging and Production Environments: Why You Need Each
Dev is for building, staging is for testing a release in near-production conditions, and production is for real users. Separate environments catch bugs before customers do, and staging is only useful with matching configuration and no real personal data.
Basics - AI & automation3 min
AI Meeting Transcription and Summaries: Tools and Setup
Record the meeting, transcribe it with a speech-to-text model, then have an LLM extract decisions, tasks and owners using a fixed template — and always tell participants they are being recorded.
Practice - Programming4 min
Concurrency vs Parallelism: What's the Difference
Concurrency is handling several tasks at once by switching between them; parallelism is literally running several tasks at the same moment on different CPU cores.
Basics - Mobile development4 min
How to Add Face ID and Fingerprint Login to a Mobile App
Biometrics never hand your app a fingerprint or face; they only unlock a key or token in the device's secure storage, so proper Face ID login is built on Keychain/Keystore, not on a yes/no check.
Practice - Marketing & analytics4 min
Customer Segmentation in Marketing: Methods and Examples
Segmentation means splitting customers into groups with similar traits or needs so each group gets its own offer, ads and messages; the data comes from your CRM, web analytics and surveys.
Basics - Design & UX4 min
How to Design Dark Mode for an App or Website
A dark theme is not inverted colors: use dark grey instead of pure black, show depth with lighter surfaces, switch accents to lighter and less saturated tints, check contrast in both themes and build everything on semantic tokens with light and dark values.
Practice - Telegram & messengers4 min
How to Grow a Telegram Channel for Business
A business channel grows from four sources: cross-promotion, paid posts in relevant channels, Telegram Ads and your own traffic from the website, bot and offline; give each source its own invite link so you can see where subscribers come from.
Practice - E-commerce & CRM4 min
How to Integrate Click Payments Into a Website
Click calls your server twice — Prepare (validate and reserve the order) and Complete (confirm the payment); your job is to verify the signature, amount and order status and respond idempotently.
Practice - Security4 min
Vulnerable Dependencies: How to Find and Fix Them
Scan dependencies regularly (npm audit, pip-audit), automate updates with Dependabot or Renovate, commit your lockfiles, and fix first what is actually reachable and exploitable in your application.
Practice
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