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The Metana Blog
Guides, tutorials & career tips.
Expert-written guides on Full-Stack Development, Web3, AI, Data, and Cybersecurity — built for aspiring engineers and tech professionals ready to level up.
SolidityTime Units in Solidity: Simplified Guide
Welcome to the fascinating world of smart contracts, where lines of code dictate financial agreements and automate complex processes. But what about time? How do we ensure actions happen at the right moment within a smar
Metana EditorialJune 14, 2024Read
Full-StackJavaScript Array Splice() Method
The JavaScript array is a fundamental building block for storing and manipulating collections of data. But what if you need to edit that data – add new elements, remove unwanted ones, or even replace existing items? That
Metana EditorialJune 13, 2024Read
Ethernaut WalkthroughEthernaut Level 12 Walkthrough: Privacy
Ethernaut Level 12 titled “Privacy” challenges the concept of “private” data on the blockchain. In this level, you’ll encounter a locked contract, and your objective is to unlock it. The key, however, isn’t so private af
Alexis AmoiJune 12, 2024Read
BlockchainTop Languages for dApp Development in 2025: Complete Guide
Decentralized Applications, commonly known as dApps, have revolutionized the way we interact with digital services, providing enhanced security, transparency, and user control. As the backbone of blockchain technology, d
Metana EditorialJune 12, 2024Read
Full-StackDemystifying SSL & Let’s Encrypt: Lock in Website Security
The internet is a vast network of information exchange. But have you ever stopped to think about how this exchange happens securely? When you visit a website and enter sensitive information like passwords or credit card
Metana EditorialJune 11, 2024Read
Ethernaut WalkthroughEthernaut Level 11 Walkthrough: Elevator
Ethernaut challenges, comparable to a Web3-themed hacking Capture The Flag (CTF) competition, offer a dynamic environment for diving into Ethereum and Solidity programming. Each level introduces a distinct smart contract
Janos BarnaJune 10, 2024Read
BlockchainOracles and External Data: Boosting Smart Contract Utility
Imagine a program that relies on stock prices to make investment decisions. It checks its internal database, but the information is outdated. The program is stuck, unable to function effectively. This is where oracles co
Metana EditorialJune 9, 2024Read
Full-StackHTML vs DOM Explained: Building Websites
Imagine a web page as a magnificent castle. The blueprints outlining the structure and layout are similar to HTML (HyperText Markup Language). But a static blueprint doesn’t make a lively castle, right? That’s where the
Metana EditorialJune 8, 2024Read
Ethernaut WalkthroughEthernaut Level 10 Walkthrough: Re-entrancy
Understanding re-entrancy is crucial for anyone developing or auditing Ethereum smart contracts. Failure to properly handle re-entrant calls can result in the loss of funds or the manipulation of contract state by malici
Georgi PlamenovJune 7, 2024Read
Full-StackJavascript Window: Browser Object Model (BOM)
TL;DR The Browser Object Model (BOM) allows JavaScript to interact with the browser, enabling dynamic web experiences. Key components include: BOM enables tasks like responsive design, user feedback, form validation, and
Metana EditorialJune 6, 2024Read
Full-StackWhat is a VPS? (Virtual Private Server)
Imagine a bustling apartment complex. Multiple tenants share the same building, but each has their own private unit with complete control over the interior. That’s the essence of a Virtual Private Server (VPS) in the clo
Metana EditorialJune 5, 2024Read
BlockchainWhat is a dApp? Decentralized Applications Simplified
We all rely on apps in our daily lives – for social media, shopping, banking, and more. But have you ever considered who controls these apps and how they operate? Traditional apps run on centralized servers, owned and ma
Metana EditorialJune 4, 2024Read
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