My favourite session thus far was 'Build Agile Business Processes with the Power Platforms - Focus on CDS, Power Apps, Power Automate + RPA'.
These are such a powerful tools for our customers and our own companies.
I've been using some power apps myself to automate my own work, but I'm keen to expand my knowledge to go deeper with the apps I do use, and to go wider and start using more of the apps on the platform myself. What I love about these is that it allows citizen developers, of which there are 3.7M. It simply allows everyone to be a 'developer', allowing people to develop tools making what they do more efficient and effective where previously the ROI would not have been realised.
I caught a screenshot which I'll post below that exemplifies this point.