Google Drive is an online program that functions as a cloud drive where you can store all kinds of files. Files that you add to your Google Drive (such as Word documents or PDFs) count toward your storage limit of 15GB. Google files (Google Docs, Google Slides, Google Sheets, etc.) do not take up space in your Google Drive account and do not count toward your storage limit.
I like to use Google for almost everything I do with office programs such as word processing, creating slideshows, and making spreadsheets. Not all functions are exactly the same as the Microsoft versions of these programs, but I find the features very close, and in many cases, better. Google continually improves their programs, so if there is a feature that you really need, chances are others need this feature too. It is likely that Google will add the feature in the future, and you can request new features through the “help” menu.
The Google “help” menu is also a good place to find tips and hints. If there is something you are trying to do, and not sure how, someone else has probably had the same question. There are usually instructions available online. Google’s help page is a great starting point if you are new to Google Drive or if you are trying to find out how to do a specific task.