Ethereum Smart Contracts

I recently became interested in learning about smart contracts. I searched on YouTube for the best way to learn them and also tried to find the perfect roadmap for understanding smart contracts and their applications. However, I haven’t been able to find something that fully clears my doubts.

I am very new to crypto, including concepts like gas fees, wallets, and everything else. I want to learn about smart contracts because I saw a video on integrating them with frontend web and mobile applications—basically, Web3 development.

Could you guys please guide me or share any reference roadmap? Your help would be greatly appreciated!