Probably most of us have used software to store data in a spreadsheet and visualize this data. However, these tools can offer much more than that! Recently, I learned that LibreOffice can find out a mathematical function which can be used to predict future values. For instance, based on historical data, we can try to forecast the growth of the average salary over time. Naturally, the accuracy of this method is not guaranteed, but that is not the point of this tutorial.

I was looking for a tutorial about photo editing in GIMP. I found a video that touches multiple tools and explains how to use them, so I thought it could be useful to jot down a checklist based on that info. Most of the mentioned tools are located in the colors menu. For details, please refer to the video.