Mahir Faysal

Hi, i am mahir. a professional web developer with full stack developing | Learning cybersecurity on TryHackMe: tryhackme.com/p/mfaysal.dev

Joined on Oct 2, 2026 https://mfaysal.com

Mahir Faysal

Nov 3

Python List vs Tuple vs Set vs Dictionary: Differences, Speed and When to Use Each (Tested Examples)

#python #beginners #programming #datastructures

10 min read

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Mahir Faysal

Nov 2

TypeError: Cannot read properties of undefined (reading 'x') in JavaScript: 10 Causes and Fixes

#javascript #debugging #webdev #node

13 min read

Mahir Faysal

Nov 1

How to Check Your Phone for Stalkerware (Android and iPhone, Step by Step)

#security #privacy #android #ios

12 min read

Mahir Faysal

Oct 31

How to Use VirusTotal to Check Files, Links and Downloads (Step-by-Step for Beginners)

#security #cybersecurity #malware #beginners

13 min read

Mahir Faysal

Oct 30

How to Check an SSL Certificate Expiry Date (Browser, OpenSSL, PowerShell, curl and Python)

#security #ssl #devops #linux

11 min read

Mahir Faysal

Oct 29

How to Check if a QR Code Is Safe Before You Scan It (iPhone, Android, UK and US)

#security #cybersecurity #privacy #mobile

13 min read

Mahir Faysal

Oct 28

How to Check Your Browser Extensions for Malware (Chrome, Edge, Firefox and Safari)

#security #cybersecurity #privacy #browser

11 min read

Mahir Faysal

Oct 27

How to Check Windows Firewall Status on Windows 11 and 10 (and Fix It Safely)

#security #cybersecurity #windows #networking

11 min read

Mahir Faysal

Oct 26

How to Check BitLocker Status on Windows 11 and 10 (3 Ways)

#security #cybersecurity #windows #encryption

12 min read

Mahir Faysal

Oct 25

How to Check Failed Login Attempts on Windows 10 and 11 (Event ID 4625)

#security #cybersecurity #windows #tutorial

10 min read

Mahir Faysal

Oct 24

How to Verify a File Checksum (SHA-256) on Windows, Mac and Linux

#security #cybersecurity #linux #windows

10 min read

Mahir Faysal

Oct 23

How to Check Open Ports on Windows, Mac and Linux (and Close the Ones You Don't Need)

#security #cybersecurity #networking #windows

10 min read

Mahir Faysal

Oct 22

How to Encrypt Your Laptop: BitLocker, Device Encryption and FileVault Step by Step

#security #cybersecurity #windows #macos

9 min read

Mahir Faysal

Oct 21

How to Create a Strong Password: Passphrases, Managers and Passkeys

#security #cybersecurity #privacy #beginners

8 min read

Mahir Faysal

Oct 20

Python Lazy Imports: How the New lazy Keyword Works in Python 3.15

#python #performance #programming #tutorial

9 min read

Mahir Faysal

Oct 19

JavaScript Temporal API Tutorial: Replace Date with Tested Examples (2026)

#javascript #node #webdev #tutorial

10 min read

Mahir Faysal

Oct 18

Why Is My Hard Drive Smaller Than Advertised? GB vs GiB Explained

#windows #beginners #hardware #computerscience

4 min read

Mahir Faysal

Oct 17

Python frozendict: The New Immutable Dictionary in Python 3.15 (Tested)

#python #beginners #programming #tutorial

10 min read

Mahir Faysal

Oct 16

Python enumerate(): How to Start at 1 (and 12 Tested Examples)

#python #beginners #tutorial #programming

9 min read

Mahir Faysal

Oct 15

MySQL GROUP_CONCAT with ORDER BY, SEPARATOR and DISTINCT (Tested on 8.4)

#mysql #sql #database #beginners

9 min read

Mahir Faysal

Oct 14

What Is %windir%? Windows Environment Variables Explained (With a List)

#windows #cybersecurity #beginners #tutorial

10 min read

Mahir Faysal

Oct 13

NTFS vs FAT32 vs exFAT: Which Format Should You Use? (Windows 2026)

#windows #cybersecurity #beginners #storage

9 min read

Mahir Faysal

Oct 12

What Is UAC in Windows? User Account Control Explained for Beginners

#windows #cybersecurity #beginners #security

10 min read

Mahir Faysal

Oct 2

Python List Comprehension Examples Explained

#python #beginners #tutorial #programming

8 min read

Mahir Faysal

Oct 2

Python f-Strings: Formatting Examples

#python #beginners #tutorial #programming

7 min read

Mahir Faysal

Oct 2

HTML Semantic Tags Explained With Examples

#html #a11y #beginners #webdev

7 min read

Mahir Faysal

Oct 2

JavaScript Async/Await Tutorial for Beginners

#javascript #async #beginners #webdev

8 min read

Mahir Faysal

Oct 2

HTML Form Input Types and Validation

#html #forms #beginners #webdev

7 min read

Mahir Faysal

Oct 2

CSS Flexbox vs Grid: When to Use Each

#css #flexbox #cssgrid #webdev

7 min read

Mahir Faysal

Oct 2

CSS Position Explained: Absolute vs Relative

#css #layout #beginners #webdev

6 min read

Mahir Faysal

Oct 2

JavaScript map, filter and reduce Explained

#javascript #arrays #beginners #webdev

8 min read

Mahir Faysal

Oct 2

PHP Form Validation and Sanitization Guide

#php #security #beginners #webdev

8 min read

Mahir Faysal

Oct 2

PHP PDO Prepared Statements for Beginners

#php #mysql #security #beginners

8 min read

DEV Community

Mahir Faysal

Badges

Hacktoberfest 2026 Fest Attendee

Writing Debut

Python List vs Tuple vs Set vs Dictionary: Differences, Speed and When to Use Each (Tested Examples)

Want to connect with Mahir Faysal?

TypeError: Cannot read properties of undefined (reading 'x') in JavaScript: 10 Causes and Fixes

How to Check Your Phone for Stalkerware (Android and iPhone, Step by Step)

How to Use VirusTotal to Check Files, Links and Downloads (Step-by-Step for Beginners)

How to Check an SSL Certificate Expiry Date (Browser, OpenSSL, PowerShell, curl and Python)

How to Check if a QR Code Is Safe Before You Scan It (iPhone, Android, UK and US)

How to Check Your Browser Extensions for Malware (Chrome, Edge, Firefox and Safari)

How to Check Windows Firewall Status on Windows 11 and 10 (and Fix It Safely)

How to Check BitLocker Status on Windows 11 and 10 (3 Ways)

How to Check Failed Login Attempts on Windows 10 and 11 (Event ID 4625)

How to Verify a File Checksum (SHA-256) on Windows, Mac and Linux

How to Check Open Ports on Windows, Mac and Linux (and Close the Ones You Don't Need)

How to Encrypt Your Laptop: BitLocker, Device Encryption and FileVault Step by Step

How to Create a Strong Password: Passphrases, Managers and Passkeys

Python Lazy Imports: How the New lazy Keyword Works in Python 3.15

JavaScript Temporal API Tutorial: Replace Date with Tested Examples (2026)

Why Is My Hard Drive Smaller Than Advertised? GB vs GiB Explained

Python frozendict: The New Immutable Dictionary in Python 3.15 (Tested)

Python enumerate(): How to Start at 1 (and 12 Tested Examples)

MySQL GROUP_CONCAT with ORDER BY, SEPARATOR and DISTINCT (Tested on 8.4)

What Is %windir%? Windows Environment Variables Explained (With a List)

NTFS vs FAT32 vs exFAT: Which Format Should You Use? (Windows 2026)

What Is UAC in Windows? User Account Control Explained for Beginners

Python List Comprehension Examples Explained

Python f-Strings: Formatting Examples

HTML Semantic Tags Explained With Examples

JavaScript Async/Await Tutorial for Beginners

HTML Form Input Types and Validation

CSS Flexbox vs Grid: When to Use Each

CSS Position Explained: Absolute vs Relative

JavaScript map, filter and reduce Explained

PHP Form Validation and Sanitization Guide

PHP PDO Prepared Statements for Beginners