How Do I Add "Back To Top" or "Back To Home"

1) How do I add a “Back To Home” or a “Back To Top” link at the bottom of my Blog/posts page?

2) How do you add a “Back To Home” or a “Back To Top” link at the bottom of your Pages?

I don’t know if it’s different codes and or php pages since one is additionally created pages and one is the actual blog with posts.

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