This article shows how to get custom option values of products/items added to cart or products of any order in Magento 2.
I will simply be using ObjectManager for this example.

This article shows how we can get list of all categories from current product or any particular product as well.
Both ways (Dependency Injection & Object Manager way) are shown below:

This article shows how you can upgrade/update your Magento 2 version through command line using composer.
In this example, I am upgrading Magento 2 to version 2.1.1.

This article shows, how you can add a new column at the end of the admin grid or after any column of the admin grid in Magento 1.x.
Suppose, you have a custom module and you need to add a column to product grid or order grid, etc. For this, you need to rewrite that particular grid block with your custom module’s block grid class.

This article shows how to get shopping cart items/products, subtotal and grand total of cart, and shipping and billing address entered while doing checkout in Magento 2.
I will be using both Dependency Injection (DI) and Object Manager in the below example code.