https://www.youtube.com/playlist?list=PLz8t3G5qXRjNFsdpc9LIvCtuB3fzYl3Nh
If you want to create a online class app follow all the tutorials
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I have changed the catagery. Just adding youtube video link, dosen’t make a guide.
Refer other guides on Community to know how a guide is made 
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Ok sorry what is the catagory
You Have To Write Your Tutorial And Provide Some Description And Screenshot Of Blocks And Explain It How It Is Works
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Please share few screenshots and a written procedure also.