Feedback and compensation loops/network w/ opamps and how they are used in switching circuits (Like power supplies). Time of compensation (type 1, 2 and 3).
Proper times to use a Microcontroller vs. a FPGA. Advantages/disadvantages and primary differences.
C vs C++ in microcontroller design.
PCB layout tools, compare and contrast. Best for beginners and advanced.... best bang for your buck.
Capture and sim tools review and opinion.
Book reviews... so many books in the electronics world... Books regarding programming, power supply design, layout, etc... good ones you have and read?
How you tackle writing a program... steps taken, flow charts, pseudo code?
Plenty of more ideas... just a few for now
Keep up the great work!