My answer assume that you have basic idea of what blockchain is and how it works in simple definitions. i wouldnt suggest you a site or channel , i have a collection over internet blogs , gits & videos you can go through

watch the video in below link for intro (if you need to start about what blockchain is ?)

Rakesh Kumar Gora's answer to What are looking things to know about blockchain technology?

this has been my reference all my way long to get started with dapp(DECENTRALIZED APPLICATION)

1. Ethereum Pet Shop -- Your First Dapp | Truffle Suite
2. CryptoZombies - Learn to code games on Ethereum. Powered by Loom Network
3. https://ethereum.network/learn
4. #4. DAPP UNIVERSITY - Dapp University

This youtube channed & website covers almost all topics with explanation and code links related to blockchain ethereum, solidity, ipfs,coding your own token, web3.js and more.

#5 What is An Ethereum Token: The Ultimate Beginner’s Guide - What is An Ethereum Token: The Ultimate Beginner’s Guide

To a beginner, the entire concept of Ethereum and Ethereum token can get very confusing very fast. The idea that Ethereum not only has its own currency (Ether) but also has tokens on top of that which can act as currency themselves, can be a little mind-boggling. Before we even begin understanding what Ethereum tokens are all about, it’s important to grasp some basic concepts.

#6. Program the Blockchain - Program the Blockchain

One of the most exciting aspects of the latest cryptocurrency technology is the inclusion of smart contracts, code that can be executed as part of a blockchain transaction. This new development platform allows for guaranteed fair (“trustless”) financial transactions. There aren’t yet many experts in this new platform, so it’s hard to find high-quality information about it. Our goal is to educate the developer community about the possibilities of smart contracts and to share tools, techniques, and best practices for authoring them.

blockchain-training-errortechnologies

#7. Guides Archive - Blockgeeks - Guides Archive - Blockgeeks

Blockgeeks’ mission is to share and grow the knowledge around Blockchain technology. A vast amount of the knowledge that would be valuable to many people is currently only available to a few — either locked in people’s heads or only accessible to select groups. Have your say on what we should do next at our public Trello Board!

#8 Vlad wulf - Solidity and Smart Contracts Tutorial for Beginners

Solidity and Smart Contracts Tutorial for Beginners - YouTube

#9. Full Stack Hello World Voting Ethereum Dapp Tutorial — Part 1 - Full Stack Hello World Voting Ethereum Dapp Tutorial — Part 1

voting dapp on ethereum blockchain

#10. SIRAJ RAVAL'S DECENTRALIZED APPLICATION COURSE

This is the first course in The School of AI and the students that sign up for it will receive weekly videos, live streams, Q&A office hours, exclusive projects, a certificate of completion, expert feedback and review to teach the foundations of this future-shaping technology.

#11. Developing Ethereum Smart Contracts for Beginners - https://coursetro.com/courses/20/Developing-Ethereum-Smart-Contracts-for-Beginners

this 100% free course where you're going to learn how to create and deploy ethereum smart contracts. Smart contracts allow you to create decentralized apps that can harness the power of the blockchain for a wide variety of use cases. In this course, I'm assuming you have no prior experience with creating smart contracts. You're going to go from absolute beginner to an intermediate understanding in a very fast amount of time.

#12.Hyperledger: blockchain - Blockchain use cases | IBM Blockchain

Unpack research into leading blockchain use cases.Learn how innovators everywhere are transforming their businesses through uses cases built on the IBM Blockchain Platform. Let’s put smart to work.

#13.amazing /the-ethereum-blockchain - GitHub - amazingandyyy/solidity-contracts: 📦 Resources for the Ethereum Smart Contract Development tutorial series.

Resources for The Ethereum Smart Contract Development tutorial series

#14. The Complete Developer's Guide - Code with Ethereum & Solidity: The Complete Developer Guide

Use Ethereum, Solidity, and Smart Contracts to build production-ready apps based on the blockchain

#15. Introduction to Ethereum Programming, Part 1 - A Gentle Introduction to Ethereum Programming, Part 1 - OpenZeppelin blog

This will be a series of posts aimed at software developers who want to ramp up to Ethereum. Please keep in mind that I do not consider myself an expert in this subject, I’d just like to teach you what I learned and save you some time if you are in the same place I was. By the end of the series you should be able to build a fully-fledged smart-contract-enabled web application (also known as DApp) on your own!

#16.Ethereum Development Guide — Part 1 – Cryptronics – Medium

This three part tutorial constitutes a guided walk-through of the Ethereum development ecosystem using a simple but useful example application, namely document certification.

#17 Smart contracts developement - Will it Scale

videos on youtube explaining smart contracts developement.

blockchain-training-certification

#18.Ethereum Development Tutorials - YouTube - Ethereum Development Tutorials

Error Technologies