How do I add a collection to my homepage? I would also like to showcase the products in home page.

To Create collections, you can follow the instructions in this article:

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Please follow the steps to showcase the products in home page:

1) Go to Shopify admin

2) Click on products

3) Click on collections > Choose Collection type > Manual

4) Name collection "Your Pick (store name or what ever you want to) "

5) Click on Your Pick

6) Scroll Down and reach Products search bar

7) Type the name of the product you want to add to that section

8) Select and press "done" at the bottom.

9) Refresh the home page of your website

Once you create the collection in shopify, you need to go to theme customise option and set the collection to show/map it with the collection.