kicked off section 4 of my Foundry course: ✅ Learned the proper way to structure Smart Contracts with the Solidity style guide. Code layouts and naming conventions to make your code cleaner and readable. ✅ Started a new project Smart Contract lottery - a sample Raffle.👨🏾‍💻

Top Smart Contract Languages To Learn (2026 edition): > Solidity (The Industry Standard) Demand Rate: Highest (approx. 65–70% market share). Ecosystems: Ethereum, Arbitrum, Optimism, Polygon, Base, Avalanche, and BNB Chain. > Rust (The High-Performance Choice) Demand Rate:

In Today's lesson, I learned: ✅ Advanced Custom Errors for gas optimization as opposed to using the expensive require string statements. ✅ Smart Contracts events - a way smart contracts communicates with the outside world like front-end apps interacting with the contract.

My Solidity journey continued today with understanding Random Numbers: ✅ Executed time checks using block.stamp and also added time-based logic to the pickWinner function. ✅ Explored Chainlink VRF (Verifiable Randomness function) and its uses in a Smart Contract instance. 👨🏾‍💻

Bounced back from a setback in the last few days.💪 My Foundry journey continued today with learning: ✅ How to integrate Chainlink VRF v2.5 random number request into a Smart Contract. ✅ Why implementing the Chainlink VRF fulfillRandomWords callback is essential.

Today I learned how to : ✅ Use the Modulo Operator for Random winner selection. ✅ Manage Smart Contract States with Solidity Enums for clearer, safer, and more maintainable state logic compared to simple booleans. ✅ Completed the first lesson quiz of section 4. Scored 60%.

My day ended with many activities including my 21-Day Solidity coding challenge. I still made time to continue my lesson on Foundry Fundamentals. ✅ I learnt how to reset the player array using a gas-efficient method - new address payable[](0); ✅ Also reset the blocktime.

Today I learnt: ✅ Chainlink Automation, a service designed to automate key functions and DevOps tasks within Smart Contracts in a highly reliable, trust-minimized, and cost-efficient manner. ✅ To define solidity custom errors that accept parameters for richer revert info.

Today's lesson was about Testing and Deploying the Lottery Smart Contract. It further explored why rigorous testing is vital for immutable smart contracts that handle assets.

The Battlechain testnet is now LIVE. Come enter the ultimate red-team platform. Give us feedback so we can launch mainnet very soon, and fix web3 security.

My journey in Foundry Fundamentals continues.. ✅ Learned about Chainlink Automation, it provides decentralized triggers for Smart Contracts. ✅ I implemented its core ‘checkUpkeep’ & ‘performUpKeep’ functions for decentralized task scheduling. ✅ Scored💯% in my quiz today.✍️🏽

Learnt new Foundry cheatcodes for testing state transitions - vm.warp and vm.roll. ✅ vm.warp sets the block.timestamp; ✅ vm.roll sets the block.number; ✅ Performed multiple tests in the Raffle contract. ✅ Crushed the quiz of the day with 💯% scores. 👨🏾‍💻

The major highlight of my day today was troubleshooting, debugging and fixing the VRF InvalidConsumer Errors in Foundry. I learned it is a common and well-known error when integrating Chainlink VRF in Foundry tests. Though I've not fully mastered it but I'm getting ahabg of it.

✅ Spent the entire day running tests and debugging some Smart Contracts, very exhausting yet mentally stimulating. ✅ Attention to details is a non-negotiable skill for a Smart Contract Dev, always check for consistency across all functions. ✅ Crushed my quiz as well. 💯%👨🏾‍💻

✅ Today I learned how to pinpoint untested codes with Foundry’s Debug Coverage Report. ✅ How to Refactor Events Data ✅ Got introduced to Fuzz Testing. ✅ Conducted end-to-end unit tests by simulating a full raffle lifecycle from entry to payout via Chainlink callback. 👨🏾‍💻

✅ Revisited some old lessons for more clarity. ✅ Utilized network-specific accounts via vm.startBroadcast(address) and skipped mock dependent tests using a skipFork modifier. ✅ Executed deployment/interaction scripts to validate system behaviour and boost script coverage.👨🏾‍💻

✅Completed the Foundry Fundamentals course on Cyfrin Updraft 🟩. ✅ Crashed out badly in my final quiz, a key feedback that I need to gain more clarity on some lessons in this section. Will be revisiting the lessons I find quite perplexing before starting Advanced Foundry. 👨🏾‍💻

As part of my review of Foundry Fundamentals, I dove deep into Refactoring for Multi-Chain Deployments using the Helper Config Pattern. This method helps to eliminate hardcoded network addresses leveraging both Foudrys HelperConfig and block.chainId. 👨🏾‍💻