If there are any programs in the office suite that you think you need some help with, Microsoft has you covered with 170+ training videos to help keep you sharp. These "LinkedIn Learning" videos cover every program in the suite from Excel to Access, and cover a variety of topics within each program so you can pinpoint exactly what it is you want to learn about.
If you want to check out some of these lessons, you just have to go to the official Office Training Center and navigate around to check out which videos you want to watch. Just click on the Office program you want to learn about, and then click on what area of the program you want to learn about. For instance, if you want to learn about text formatting in PowerPoint, just click on the PowerPoint logo in the Office Training Center and navigate to the "Add and Format Text" lessons.
It seems like Microsoft is going to be adding more and more to the Office Training Center - this most recent batch of videos numbered around 60. Feel free to keep an eye on the website for more training in Office.