Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- Mobile development4 min
CI/CD for Mobile Apps: Automating Builds with Fastlane and Codemagic
Fastlane turns release steps into code (signing, building, testing, store uploads), while Codemagic provides hosted macOS machines and built-in publishing. Teams often combine them, with secrets kept only in encrypted CI variables.
Advanced - Marketing & analytics5 min
Multi-Armed Bandit vs A/B Testing: When to Use Each
Use a multi-armed bandit when you want to earn the most during a short test (promos, headlines, ad creatives); use a classic A/B test when you need a reliable answer about which variant is better and by how much.
Advanced - Design & UX4 min
Serif vs Sans Serif Fonts: When to Use Each
On modern screens both serif and sans serif fonts read well at normal sizes; the choice is mostly about character and context. Sans serif suits interfaces and small UI text, serif suits long reading and editorial or premium tone, and a pair of one of each covers most needs.
Basics - Telegram & messengers4 min
Telegram Mini App Design: Theme, Buttons and Native Feel
A Mini App feels native when it takes colors from the Telegram theme, respects safe areas, uses MainButton and BackButton instead of custom controls, adds haptic feedback and opens almost instantly.
Practice - E-commerce & CRM4 min
Payment Aggregator vs Direct Merchant Account: Key Differences
An aggregator accepts payments for you under its own bank contract, so onboarding is fast but you get less control and higher freeze risk; a direct merchant account takes more paperwork but gives you your own terms and stability at high volume.
Basics - Security4 min
Software Supply Chain Attacks and How to Defend Against Them
A supply chain attack targets not your code but what it is built from — packages, tools and CI; defense relies on pinning versions, blocking install scripts, SBOMs, signature verification and least privilege in CI.
Advanced - Databases & data4 min
SQL Subqueries vs CTE: How to Write Readable Queries
A subquery suits a short check inside a condition, a CTE (WITH) suits multi-step logic you want to read top to bottom, and a recursive CTE is the standard way to walk a hierarchy; in modern databases their speed is usually the same.
Practice - Hosting & cloud4 min
VPS Snapshots vs Backups: What Is the Difference
A snapshot is a fast copy of the whole disk kept inside the same provider, great for rolling back a bad update; a backup is an independent copy of files and databases stored elsewhere that survives losing the server, the account or the provider. You need both.
Basics - IT careers3 min
Product Manager vs Project Manager: What Is the Difference
A product manager owns what to build and why, so the product delivers value to users and the business. A project manager owns how and when it gets done: timelines, budget, resources and risks.
Basics - Tools & no-code4 min
Postman vs Insomnia vs Bruno: Choosing an API Client
Postman is the richest cloud platform for mixed teams with QA and managers, Bruno is an offline client that stores collections as files right in your Git repo, and Insomnia sits in between with a choice of local, cloud or Git storage.
Basics - IT by industry4 min
Legal Document Automation: Generating Contracts From Templates
Document automation turns a standard contract into a template with variables and conditional clauses: someone answers a questionnaire, the system assembles the document, routes it for approval and signature and keeps every version, while AI helps with drafts and review but not with final text without a lawyer.
Practice - Networks & office IT4 min
NAT and Port Forwarding Explained: Public vs Private IP
Devices in an office use private IPs that are not reachable from the internet; NAT on the router lets them all go online through one public IP, and port forwarding opens a specific service to the outside, which is convenient but exposes it to attacks.
Basics - IT for business3 min
Outsourcing vs In-House Development: Which Is Right for You
Outsourcing is faster and more flexible early on and for one-off projects; an in-house team pays off when software is core to the business and work never stops.
Basics - Web development5 min
Optimistic UI Updates in React: Patterns and Rollback
Optimistic UI shows the expected result immediately and syncs with the server in the background; it needs a snapshot for rollback, protection from races and duplicates, and should never be used where a false "success" costs money.
Advanced - SEO4 min
Next.js SEO: Metadata, Sitemap and robots in the App Router
In the App Router SEO is configured in code — a metadata object or generateMetadata for titles, canonical and hreflang, sitemap.ts and robots.ts for crawling, opengraph-image for previews; the key is absolute URLs via metadataBase and a canonical of its own on every page.
Practice - DevOps4 min
Load Balancing Algorithms: Round Robin, Least Connections and More
Round robin is usually enough for stateless APIs, least connections suits long-lived connections like WebSocket or streaming, weighted variants handle uneven servers, and IP hash is only for when sticky sessions are unavoidable.
Basics - AI & automation3 min
Is It Safe to Share Company Data With ChatGPT and Other AI
It depends on the tier: business plans and APIs do not train on your data by default, while free consumer chats may. Passwords, keys, customer personal data and trade secrets should never go into any public AI tool.
Basics - Programming4 min
Testing in Python with pytest: Fixtures, Parametrize and Mocks
pytest tests are plain test_* functions with ordinary assert; fixtures prepare data and resources, parametrize runs one test over many inputs, and mocks replace the network and external services.
Practice - Mobile development4 min
How to Design a Paywall That Converts in a Subscription App
A paywall converts when it appears right after the user feels the value, offers two or three clear plans with the billed price shown honestly, explains the trial terms and is tested with remote variants measured by revenue, not taps.
Practice - Marketing & analytics4 min
How to Import Offline Conversions from CRM into Google Ads
Store the GCLID in your CRM with every lead, and when a lead becomes qualified or turns into a payment, send that conversion with its value back to Google Ads; bidding then optimises for real sales instead of form fills.
Advanced - Design & UX4 min
Touch Target Size and Thumb Zone in Mobile Design
Make tappable areas at least 44×44 pt on iOS and 48×48 dp on Android (WCAG's AA minimum is 24×24 CSS px), keep space between them, and put frequent and primary actions in the lower part of the screen where the thumb reaches easily.
Practice - Telegram & messengers4 min
How to Use Telegram Polls and Quizzes in Channels and Bots
In channels, polls work well for research and engagement but are always anonymous; to know who answered what and qualify leads, send a non-anonymous poll from a bot in a private chat and read the answers through poll_answer updates.
Basics - E-commerce & CRM4 min
How to Automate Payment Reconciliation in E-commerce
Automated reconciliation links three sources — orders, gateway reports and bank statements — by shared identifiers, accounts for fees and refunds, and sends only real discrepancies to a review queue.
Advanced - Security4 min
SPF, DKIM and DMARC: Stop Email Spoofing of Your Domain
SPF lists the servers allowed to send mail for your domain, DKIM signs your messages, and DMARC tells receivers what to do with mail that fails those checks and sends you reports. Together they stop scammers from sending email in your domain's name.
Practice
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