Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- Databases & data4 min
How to Build a Simple ETL Pipeline in Python
A simple Python ETL is three functions (extract, transform, load) plus four reliability rules: retries on network failures, idempotent loading via upsert, incremental extraction by timestamp, and scheduled runs with logs.
Practice - Hosting & cloud4 min
Object Storage Classes and Lifecycle Rules to Cut Storage Costs
Move rarely read data to cheaper storage classes with lifecycle rules, but account for retrieval fees and minimum storage durations, and always add rules that delete old versions and incomplete multipart uploads.
Advanced - IT careers4 min
Common Junior Developer Mistakes and How to Avoid Them
Most junior developer mistakes are about communication rather than code: ask in time, report blockers early, keep solutions simple and treat feedback as a way to grow faster.
Practice - Tools & no-code4 min
Notion API: How to Connect Databases to Your Site or Bot
Create an internal integration, add it to your database via the Connections menu and call the API from your server with the token: a database query returns up to 100 entries at a time, and a 429 response means wait and retry.
Advanced - IT by industry4 min
How E-Government Works: Digital Public Services Explained
E-government combines a public service portal, digital identification and interagency data exchange: a person verifies their identity online once, and agencies request the needed records from each other instead of sending them from office to office.
Basics - Networks & office IT4 min
Slow Internet in the Office: Step-by-Step Troubleshooting
First test speed over a cable plugged straight into the router: if it is fine, the problem is Wi-Fi or the local network; if not, it is the router or the ISP. Then narrow it down step by step.
Practice - IT for business3 min
Risk Management in IT Projects: A Checklist for Clients
List risks in five groups (people, scope, tech, integrations, deadlines), rate each by likelihood and impact, assign an owner and an action, and review the list at every project meeting.
Practice - Web development4 min
Monorepo for Web Projects: Turborepo, Nx and pnpm Workspaces
A monorepo keeps the website, admin, API and shared packages in one repository; pnpm workspaces link the packages, while Turborepo or Nx speed up builds with caching and running only affected tasks.
Advanced - SEO4 min
What Is Keyword Difficulty and How to Assess It
Keyword difficulty is a tool's estimate of how hard it is to reach the top 10 for a query, usually based on the backlinks and authority of pages already ranking; treat it as a rough filter and confirm it by looking at the actual results page.
Basics - DevOps4 min
Kubernetes ConfigMaps and Secrets: How to Manage App Config
Keep non-sensitive settings in ConfigMaps and credentials in Secrets, inject them as env vars or mounted files, and remember that base64 is encoding, not encryption — protect Secrets with RBAC, encryption at rest and tools like Sealed Secrets or External Secrets Operator.
Practice - AI & automation3 min
How to Choose an LLM for Your Business Task
Define the task and data requirements first, shortlist 2-3 suitable models, and compare them on 30-50 of your real examples for quality, speed and price — the cheapest model that clears your quality bar wins.
Practice - Programming3 min
JavaScript Promises and async/await: A Practical Guide
A promise is an object holding a future result and async/await is cleaner syntax on top of it; run independent requests in parallel with Promise.all and catch errors with try/catch.
Practice - Mobile development4 min
Mobile App for an Online Store: When It Pays Off and What to Include
An app pays off when a store has many repeat purchases and a loyal base it can bring back with push notifications and rewards; new buyers are better won by a fast mobile site, and the app must run on the same data as the site and 1C.
Basics - Marketing & analytics4 min
How to Promote a Business on Instagram: Organic and Paid
On Instagram, organic content builds trust and ads deliver scale: make your profile explain what you offer in seconds, use Reels for reach and Stories for trust, and run ads in Ads Manager with a clear path to an inquiry in Direct or on your site.
Practice - Design & UX4 min
Logo Design Process: From Brief to Final Files
A logo goes through a brief, research, many rough sketches, two or three developed concepts, careful vector construction and tests at small sizes and in one color, and ends with a set of vector and raster files plus basic usage rules.
Practice - Telegram & messengers4 min
How to Run a Business Telegram Channel: Content Plan and Formats
Keep a mix of useful posts, product, behind the scenes, reviews and interactive content, post at a predictable pace you can sustain for months, and check channel stats monthly: post reach, ERR, shares, reactions and unsubscribes.
Practice - E-commerce & CRM4 min
Marketplace vs Your Own Online Store: Pros, Cons and Costs
A marketplace gives you ready traffic in exchange for commissions and dependence on someone else's rules, while your own store gives you control over customers and brand but you must bring traffic yourself; combining both usually works best.
Basics - Security5 min
Russian Federal Law 152-FZ on Personal Data: Key Requirements
If you collect personal data of Russian citizens, you are an operator under 152-FZ: you must notify Roskomnadzor, obtain separate consent, store Russians' data first in databases located in Russia, keep a set of documents and report breaches within 24 hours.
Basics - Databases & data4 min
Redis Persistence: RDB vs AOF and How Not to Lose Data
RDB takes periodic snapshots and can lose changes since the last one, while AOF logs every write and with appendfsync everysec usually loses no more than a second; for sessions and queues enable AOF alongside RDB, for a pure cache persistence is often unnecessary.
Practice - Hosting & cloud4 min
Public, Private and Hybrid Cloud: What Is the Difference
A public cloud is shared provider infrastructure you pay for by usage, a private cloud is dedicated to one company, and a hybrid cloud connects the two so each workload runs where it fits best.
Basics - IT careers4 min
Junior, Middle, Senior: How Developer Levels Really Differ
Your level is defined not by years of experience but by how independently you work and what scope you own. A junior solves assigned tasks with help, a middle independently delivers whole features, and a senior owns technical decisions and makes the whole team stronger.
Basics - Tools & no-code4 min
How to Build a Company Wiki in Notion
A working Notion wiki rests on three things: a simple structure with a handful of top-level sections, consistent page templates, and a named owner for every page with a date for its next review.
Practice - IT by industry4 min
How a Freight Exchange Platform Works for Shippers and Carriers
A freight exchange is a marketplace where shippers post loads, the system matches vetted carriers who bid or accept a rate, and the platform handles tracking, documents and payment.
Advanced - Networks & office IT4 min
How to Set Up a Small Office Network from Scratch
Start with a list of people, devices and services, then pick an ISP, a business router, a managed PoE switch and ceiling access points, and split the network into staff, guest and device segments with a written IP plan.
Practice
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