Why?
The first few reasons that come to mind:
1) To quote a friend of mine, “If a 50 year old boilermaker can work it out, then anyone can.”
2) MS Access will more than likely be installed on your computer at work.
3) Almost all "startup" type programs will need databasing of some sort.
4) It has macros and modules (VBA - Visual Basic for Applications)
5) As you start to learn Visual Basic for Application you can use this to potentially automate things at work as it available across Word and Excel.
Read these to get started:
Database basics [1]
This article provides a brief overview of databases -- what they are, why you might want to use one, and what the different parts of a database do.
Database design basics [2]
A properly designed database provides you with access to up-to-date, accurate information.
Learn the structure of an Access database [3]
Becoming familiar with the tables, forms, queries, and other objects in a database can make it easier to perform a wide variety of tasks, such as entering data into a form, adding or removing tables, finding and replacing data, and running queries.
[1] https://support.office.com/en-us/article/Database-basics-2C5...
[2] https://support.office.com/en-gb/article/Database-design-bas...
[3] https://support.office.com/en-us/article/Learn-the-structure...