Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- Databases & data4 min
What Is a Graph Database and When to Use Neo4j
A graph database stores data as nodes and the relationships between them and walks chains of relationships of any depth quickly; use it when the core question is who is connected to whom and through what, not how much.
Basics - Hosting & cloud4 min
What Is a VPC: Subnets, Security Groups and Gateways Explained
A VPC is your own isolated network inside a cloud: you split it into public and private subnets, filter traffic with security groups and route it through internet and NAT gateways, so the database never faces the internet.
Basics - IT careers3 min
Take-Home Test Assignments: How to Complete Them Well
Read the requirements carefully and ask questions, cap your time and do the core well, show clean code with tests and a clear README, and politely decline assignments that are oversized or look like unpaid work.
Practice - Tools & no-code4 min
Tilda Zero Block: Custom Layouts and Animation Guide
Zero Block is Tilda's free-form layout editor: you build a block from elements on an artboard, adjust every breakpoint from desktop down to 320 px separately and add basic or step-by-step animation; the key is to check every breakpoint, not just desktop.
Practice - IT by industry4 min
Online Exams: Proctoring and Anti-Cheating Methods
Layered measures work best: question randomization and time limits remove most cheating, browser lockdown and proctoring are added as exam stakes rise; AI proctoring produces false positives, so a human must always make the final call.
Advanced - Networks & office IT4 min
How to Set Up a WireGuard VPN for Remote Employees
Run WireGuard on a router, VPS or office server, give every device its own key pair and VPN IP, list only office subnets in AllowedIPs, and remove the peer from the server when someone leaves.
Practice - IT for business4 min
Restaurant and Cafe Automation: Orders, Delivery and Loyalty
For a single venue, start with a POS system and a kitchen display, then add stock control and delivery aggregators, and only after that your own ordering bot, app and loyalty program.
Practice - Web development4 min
React vs Angular: Library or Full Framework
React is a flexible library where you assemble the stack for the task. Angular is a full framework with strict structure, suited to large teams and long-lived projects.
Basics - SEO4 min
What Is TTFB and How to Reduce Server Response Time
TTFB is the time from a request to the first byte of the response; it delays everything else, including LCP, and slows crawling. Reduce it with caching, a CDN, static generation, database query optimisation and hosting close to your users.
Practice - DevOps3 min
Nginx vs Apache: Performance, Configuration and Use Cases
Nginx handles static files and many concurrent connections better and is the usual reverse proxy, while Apache is convenient where .htaccess and built-in modules matter, such as shared hosting and legacy PHP projects.
Basics - AI & automation4 min
Long-Term Memory for AI Agents: Patterns and Storage
Long-term memory means storing selected information outside the model and loading only what is relevant into each request; combine a user profile, extracted facts and vector recall, give every memory a source and expiry, and let users see and delete it.
Advanced - Programming4 min
Regular Expressions for Beginners: Syntax Cheat Sheet
A regular expression is a text-matching pattern built from character classes, quantifiers, anchors and groups; learn those four building blocks and you can read most regexes.
Basics - Mobile development4 min
Push Notification Best Practices: How Not to Get Disabled
Ask for permission when the benefit is obvious, send only what is useful to a specific segment in their local time and without overdoing it, deep link to the right screen and track not just opens but opt-outs too.
Practice - Marketing & analytics3 min
How to Advertise on TikTok: TikTok Ads Manager for Business
On TikTok, ads that look like regular videos win: set up the pixel with events, launch a conversion-optimized campaign, test several vertical videos and boost organic posts that already work with Spark Ads.
Practice - Design & UX4 min
Form Design Best Practices for Web and Mobile
A usable form asks only for what is necessary, gives every field a visible label above it, uses the right input types for mobile keyboards, and reports errors right after a field is completed, next to it, in plain language.
Practice - Telegram & messengers4 min
What Is a Telegram Bot and What Can It Do for Business
A Telegram bot is a program that talks to people through Telegram by rules you define; it can only message users who started it first, but it takes leads, answers questions and syncs data with your systems around the clock.
Basics - E-commerce & CRM4 min
How to Organize Returns and Refunds in an Online Store
Publish a clear return policy, move every return through the same statuses from request to decision, refund via the original payment method through the gateway, and update stock and accounting right away.
Practice - Security4 min
What Are Passkeys and Will They Replace Passwords
A passkey is a pair of cryptographic keys that replaces a password: the private key stays on your device and unlocks with a fingerprint, face or PIN, the site keeps only the public key, and a fake site cannot use it, so phishing and password leaks stop working.
Basics - Databases & data4 min
What Is a Time-Series Database: TimescaleDB, InfluxDB and More
A time-series database is optimized for data that arrives as timestamped measurements, is mostly appended, queried by time ranges and aged out over time; start with PostgreSQL, and move to TimescaleDB, InfluxDB, ClickHouse or Prometheus when volume, retention or rollups make plain tables painful.
Basics - Hosting & cloud3 min
What Is a VPS and When a Business Needs One
A VPS is a virtual server with guaranteed resources and full access, running inside a shared physical machine; you need one when a project requires its own software, steady speed and freedom to configure.
Basics - IT careers4 min
How to Prepare for a Technical Interview as a Developer
Ask the recruiter for the interview stages, prepare for each one separately with your level in mind, practice reasoning out loud, and when you do not know an answer, say what you do know and reason from fundamentals.
Practice - Tools & no-code4 min
Trello Automation with Butler: Rules, Buttons and Examples
Butler is Trello's built-in no-code automation: rules react to events, scheduled and due date commands run on time, and buttons run actions on click; start with two or three rules that remove repetitive clicks and test each one on a copy of the board.
Practice - IT by industry4 min
Own Delivery App vs Food Aggregators: What Pays Off
An aggregator brings new customers fast but takes a commission on every order and keeps the data; your own app pays off once you have a steady flow of regulars, so most restaurants are best served by a hybrid: aggregator for acquisition, own channel for repeat orders.
Basics - Networks & office IT4 min
WPA Enterprise Wi-Fi with 802.1X and RADIUS: Setup Guide
WPA Enterprise replaces one shared password with personal credentials or certificates checked by a RADIUS server via 802.1X, so you can revoke a single user, see who connected and put each person in the right VLAN.
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