Use Inkscape's LaTeX and PDF export feature (the pdf_tex format) to create figures that have a size, font family, and font size consistent with the rest of your document. You can also use this feature to add references, citations, or math within a figure. This will help your figures look more professional and intentional than images created or edited in other software, such as spreadsheets.
00:00 Introduction
01:30 Finding the figure size
03:20 Creating a file of appropriate size
04:03 Adding graphical elements and previewing
07:30 The real magic: text elements
10:15 Example of adding math to a figure
11:14 Considerations for sizing and positioning text
14:50 Recommendations for positioning text