Learning video course address: https://www.bilibili.com/video/BV1NJ411D7rf?spm_id_from=333.999.0.0&vd_source=70b32e0c05edf734741bc8828fedc612
Mind Map https://www.processon.com/view/link/61ec22557d9c085d60542953
Version
Sample demo https://github.com/KrisJiaqiXie/my_simple_voting_dapp
safety red line
Block fee: https://ethgasstation.info/
Gass cannot be 0, you can transfer it yourself
remix write contract website: https://remix.ethereum.org/