Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- Databases & data4 min
How to Import CSV and Excel Data into PostgreSQL
Load the file into a staging table with text columns first using COPY, \copy, DBeaver or Python, then cast types, remove duplicates and move only validated rows into the real table.
Practice - Hosting & cloud4 min
How to Deploy a Web App to Azure App Service
Create an App Service plan (it sets region, OS and pricing tier), add a web app with the right runtime, deploy via GitHub Actions or zip deploy, keep secrets in app settings, and release through a staging slot and swap for zero downtime.
Practice - IT careers4 min
Freelance vs Full-Time Job in IT: Pros and Cons
A full-time job gives stable income, social benefits and faster growth through a team, while freelancing offers freedom and potentially higher income at the cost of instability and handling taxes and clients yourself.
Basics - Tools & no-code4 min
Google Apps Script: Automating Google Sheets
Apps Script is JavaScript that runs on Google servers next to your spreadsheet: it can add your own formulas, react to edits or a schedule, send emails and pull data from APIs, within daily quotas and a time limit per run.
Advanced - IT by industry5 min
Cold Chain Monitoring: IoT Temperature Sensors in Logistics
Put calibrated sensors in every critical zone, choose loggers or real-time trackers by how fast you must react, set thresholds with delays and escalation, and feed the data into your TMS/WMS so every shipment has a provable temperature history.
Advanced - Networks & office IT4 min
How to Choose a Video Surveillance System for an Office or Shop
Start from goals and a floor plan: decide what each camera must see, match the lens and resolution to that zone, record to an NVR, the cloud or both, set a retention period and put up surveillance notices.
Practice - IT for business3 min
How to Automate a Small Business: Where to Start
Start with a process map, not a software purchase: find frequent repetitive manual tasks, automate one or two of the simplest, measure time before and after, and only then move on.
Practice - Web development3 min
CSS Flexbox Guide: Properties and Layout Examples
Flexbox lays elements out along one axis: a container with display: flex controls direction, alignment and gaps, while items control how they grow and shrink.
Practice - SEO4 min
How to Get Featured Snippets and Quick Answers
Find queries where you already rank in the top 10 and a quick answer is shown, then place a short, precise answer right under a question heading in the matching format: paragraph, list or table.
Practice - DevOps4 min
Docker Image vs Container: Layers, Tags and Lifecycle Explained
A Docker image is an immutable template made of read-only layers; a container is a running instance of that image with its own thin writable layer on top, created, started, stopped and removed independently.
Basics - AI & automation3 min
AI Ticket Classification and Routing for Support Teams
A model reads each ticket and returns topic, urgency and language in a strict format, rules route it to the right queue by those tags, and errors are tracked through agent corrections.
Practice - Programming3 min
DRY, KISS and YAGNI: Programming Principles Explained
DRY means one piece of knowledge in one place, KISS means the simplest working solution, YAGNI means not building what you do not need yet; apply them together, not alone.
Basics - Mobile development4 min
Expo vs Bare React Native: Which Workflow to Choose
For most new projects, start with Expo: it does not block native code, it plugs it in through development builds and config plugins. Bare React Native makes sense when you actively hand-edit the native projects.
Practice - Marketing & analytics3 min
Why Marketing Emails Go to Spam and How to Fix Deliverability
Emails go to spam when mailbox providers cannot verify the sender (no SPF, DKIM or DMARC) or do not trust it because of complaints, dead addresses and sudden volume spikes; the fix is domain authentication, gradual warm-up and a clean list.
Practice - Design & UX4 min
How to Design AI Chat Interfaces: UX Patterns for LLM Products
A good AI chat streams answers as they generate, helps users start a prompt, shows sources and the limits of its confidence, lets people edit and regenerate, handles errors and refusals honestly — and is used only where dialogue beats a form.
Advanced - Telegram & messengers4 min
How to Scale a Telegram Bot for High Load
Receive updates via webhook and push them straight into a queue, process them with stateless workers that keep state in Redis, deduplicate by update_id, and route outgoing messages through a shared rate limiter.
Advanced - E-commerce & CRM4 min
How to Connect a CRM to Your Website, Telephony and Messengers
Each channel connects to the CRM through a ready connector or an API: forms send data via a webhook, telephony creates a record on each call, and messengers arrive through chat connectors. To keep the database clean you need phone normalization, duplicate checks and a recorded source for every request.
Practice - Security5 min
HashiCorp Vault vs AWS, GCP and Azure Secret Managers
If your infrastructure lives in one cloud and the team is small, use that cloud's built-in secret manager; Vault pays off with multi-cloud or your own servers, when you need dynamic secrets, and when the team can afford to run it.
Advanced - Databases & data4 min
How to Install and Configure PostgreSQL on Ubuntu
Install PostgreSQL from the Ubuntu repositories with apt, create a separate login role and database for your app, open remote access only for specific IP addresses via listen_addresses and pg_hba.conf, and size shared_buffers, work_mem and connections to your VPS memory.
Practice - Hosting & cloud4 min
Why DNS Changes Take Time: Propagation and TTL
Resolvers cache DNS answers for the length of the TTL, so after you change a record some users keep seeing the old value until their cache expires; lowering the TTL in advance makes a planned switch fast.
Basics - IT careers3 min
Frontend Developer Roadmap: What to Learn and in What Order
Learn frontend in layers: HTML and CSS, then JavaScript, Git and APIs, then one framework, TypeScript, build tooling and testing, and lock in every stage with a project of your own.
Practice - Tools & no-code3 min
Google Docs Collaboration: Suggestions, Comments and History
Edit other people's text in Suggesting mode, ask questions with assigned comments, save key milestones as named versions and lock the final version through an approval.
Practice - IT by industry4 min
Computer Vision for Quality Control on Production Lines
Computer vision inspects every part with a camera and a model that flags defects; success depends less on the algorithm than on stable lighting, representative defect images, agreed accuracy targets and a clear action when a defect is found.
Advanced - Networks & office IT4 min
How to Choose a NAS for the Office: Synology, QNAP or DIY
Choose a NAS by usable capacity with a growth margin, the number of bays for RAID, and the software you will actually maintain: Synology for simplicity, QNAP for hardware flexibility, DIY when you have in-house expertise.
Practice
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