# Tutorials
Useful tips for building a dApp by using Connex2
This article is helping you to understand how to use connex2 to build a Dapp and also how it interacts between the user,application, and Sync2.
Transaction Dependency
VeChainThor provides a safety mechanism that allows users to force a TX to depend on the success of another TX.
Designated Fee Delegation
The TX-fee-delegation mechanism (both VIP-191 and MPP) on VeChainThor.
How to Integrate VIP-191 (III)
This is the last part of the tutorial. It mainly explains the sponsor’s initiative to inspect the transaction and sign his signature on it. We will use the express.js library to build a framework to receive transmission and return the result.
How to Integrate VIP-191 (II)
From the previous episode, we have learned the basic “terminologies” of VeChain VIP-191 fee delegation. To summarize, the process can be simply described as below
How to Integrate VIP-191 (I)
VIP-191 is a fee delegation proposal that gets realized on VeChain that enables the end-user to use blockchain without paying native tokens/cryptocurrencies. The fee is paid by a sponsor.
How To Develop a DApp on VeChain (III) ： Components & Coding
Congratulations! You have made to the last episode of this tutorial. Here we will put everything we know together and make a useful program a VTHO token transfer tool. The official Sync only provides the VET transfer functionality, our VTHO tools is a very good supplement to the status quo.
How To Develop a DApp on VeChain (II) ： Setup & Walk Around
Great! I see you have survived the last tutorial, now it is time to start programming. The first thing we need is a Sync environment.
How To Develop a DApp on VeChain (I)： Intro
In this tutorial, I will walk through with you guys about *how to* build up an ERC20 standard token transfer web page on VeChain.