Blog
Development, infrastructure, SEO, AI and IT for business — short and to the point.
1495 articles
- Databases & data4 min
Data Cleaning: How to Prepare Data for Analysis
Data cleaning is a sequence of steps: find and remove duplicates, decide how to treat missing values, bring formats to one standard, flag outliers and document every rule so the process can be repeated.
Practice - Hosting & cloud4 min
AWS IAM Explained: Users, Groups, Roles and Policies
IAM decides who can do what in your AWS account: identities (users, groups, roles) get permissions through JSON policies, everything is denied unless explicitly allowed, and the root account should be locked away with MFA while daily work uses roles.
Basics - IT careers4 min
Behavioral Interview in IT: Answering with the STAR Method
Answer behavioral questions with STAR: describe the situation and task briefly, spend most of the time on your own actions, and finish with a clear result and what you learned.
Practice - Tools & no-code4 min
How to Automate Lead Collection from Site Forms Without Code
The site form sends a webhook to Zapier, Make or n8n; the workflow normalizes contacts, checks the sheet for duplicates, assigns a manager in rotation or by rule, saves the lead, posts to the team chat and sends a separate alert whenever something fails.
Practice - IT by industry4 min
AI for Accountants: Practical Use Cases and Limits
AI is good at removing routine work, such as categorizing transactions, reading documents, assisting reconciliation and searching regulations, but an accountant must verify every result and client data must never go to uncontrolled services.
Basics - Networks & office IT4 min
How to Calculate Storage and Bandwidth for Video Surveillance
Archive size equals total camera bitrate times recording time: one camera at 1 Mbit/s writes about 10.8 GB per day, so multiply by bitrate, cameras, days and the share of time actually recorded, then add a margin.
Practice - IT for business3 min
Build vs Buy: A Framework for Software Decisions
Buy off-the-shelf for standard processes and build where software creates a competitive advantage, weighing total cost of ownership, time to market, integrations and long-term control.
Advanced - Web development4 min
Chrome DevTools Guide for Web Developers
Chrome DevTools is a toolkit built into the browser: Elements for layout, Console for errors, Network for requests, Performance for speed, Application for storage and Lighthouse for audits.
Practice - SEO4 min
How to Do Link Building Outreach: Emails That Get Replies
Outreach works when you contact a small number of relevant sites, reach the actual author or editor, offer something useful to their readers, send no more than two follow-ups and never buy links.
Practice - DevOps4 min
Cache Invalidation Strategies: TTL, Write-Through and Stampedes
For most systems, use cache-aside with a TTL and delete the key on every write; protect hot keys with a lock or single-flight, add jitter to TTLs and serve stale data while refreshing in the background.
Advanced - AI & automation4 min
AI Chatbot vs Scripted Bot: Which One Your Business Needs
A scripted bot is cheaper, predictable and ideal for routine actions; an AI bot understands free text but needs guardrails. Most businesses win with a hybrid: buttons for operations, AI for questions.
Basics - Programming4 min
Trees and Binary Search Trees: A Practical Guide
A binary search tree keeps smaller keys to the left of each node and larger keys to the right, giving O(log n) lookups, but only while the tree stays balanced.
Practice - Mobile development4 min
How to Request App Permissions on iOS and Android the Right Way
Ask for a permission at the moment the user starts the action that needs it, and explain why. If access is denied the app must keep working, and limited photo or location access should be handled as a normal case.
Practice - Marketing & analytics4 min
How to Build a Sales Funnel for a Service Business
A service funnel is the chain ad → landing page → lead → qualification → consultation → deal, where every step has its own tool, owner and conversion metric, and all data meets in a CRM.
Practice - Design & UX4 min
Brand Tone of Voice: What It Is and How to Define It
Voice is your brand's constant personality in writing, tone is how that personality sounds in a given situation; define voice with 3-4 attributes plus do/don't examples, then tune tone for each channel and language.
Basics - Telegram & messengers3 min
aiogram vs python-telegram-bot vs pyTelegramBotAPI: How to Choose
Pick aiogram for complex async bots with dialogs and load, python-telegram-bot when documentation and stability matter most, and pyTelegramBotAPI for simple bots and learning.
Basics - E-commerce & CRM3 min
How to Set Up a Sales Pipeline in amoCRM
An amoCRM pipeline is built from your real sales process: each stage is a verifiable action by the customer or salesperson; then you add the fields you need, per-stage tasks and messages, and lead sources.
Practice - Security4 min
Broken Access Control and IDOR: Finding and Fixing Them
IDOR happens when a server returns an object by ID without checking that it belongs to the current user. Fix it with server-side authorization on every request, queries scoped to the owner and automated tests proving user B cannot see user A's data.
Practice - Databases & data4 min
Data Lake vs Data Warehouse vs Lakehouse
A data warehouse stores cleaned, structured data for reporting, a data lake stores any raw data cheaply in its original form, and a lakehouse adds warehouse-style tables and transactions on top of a lake. Many small companies only need a regular database and a BI tool.
Basics - Hosting & cloud4 min
How to Create Your First AWS Lambda Function
Create a function in the Lambda console, turn on a Function URL or connect API Gateway, give the role only the permissions it needs and read logs in CloudWatch. You pay for the number of invocations and for run time weighted by allocated memory.
Practice - IT careers3 min
Bootcamp vs University vs Self-Study: How to Learn IT
University gives deep foundations and a degree but takes years; bootcamps offer a fast, structured start for a fee; self-study is cheap and flexible but needs strong discipline. Choose by your time, budget and goal.
Basics - Tools & no-code4 min
Absolute vs Relative Cell References in Excel and Google Sheets
The $ sign locks part of an address: $A$1 never changes when copied, A1 shifts fully, $A1 locks the column and A$1 locks the row; press F4 to cycle through them.
Basics - IT by industry4 min
Automating Apartment Installment Payments for Developers
The payment schedule is generated from the contract automatically, and the system sends reminders, accepts online payments, charges penalties by contract rules and syncs data between CRM, 1C and the buyer's cabinet.
Practice - Networks & office IT4 min
Cloud PBX vs On-Premise PBX: Which Phone System to Choose
A cloud PBX suits most companies that want a fast launch without their own server or admin, while an on-premise PBX makes sense with heavy internal calling, strict data storage requirements and an in-house IT specialist.
Basics
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