PackageBuilder & GitHub

1. How to download all the metadata from sandbox / Generate package.xml of all the components?

There are many ways to do this,Please Refer1,Refer2

     I used the this tool https://packagebuilder.herokuapp.com/

   

2. How to upload code to GitHub & Expose to publicly?

Open https://github.com/

     

1. Sign Up

2. Create new repository

3. Commit one file [Ex: ReadMe file] to get the Upload Files button option for drag and drop files easily.