Where are the pst files stored on my computer?

Hello everyone,
Please, someone enlighten me because I've spent countless hours searching.
I am looking to find where outlook pst files are stored on my computer. I have already watched countless videos on YouTube, and they all show the way it works on outlook.com; however, I only have access to outlook live, which doesn't have the classic writing bar like “File/Home/Send-Receive/Folder” etc, so I can't follow the steps given in the videos.
Can someone please help me ?