How to Calculate Due Dates with Google Sheets

Say the date today is the 12th of August 2022. If I were to ask you what the date is tomorrow and the date the day after, you’d be able to figure it out quickly without much calculation.
Likewise, when someone asks you about a date six months after the 12th of August 2022? That may require a bit of work, and you can answer it with a quick Google search.
But what if there are many different events that you have to calculate the due date for (like in the screenshot below), then googling one