Can oscilloscopes check the health of capacitors?

[tggzzz]

OK, points taken.   You need a circuit for taking in voltage input with resistor and the capacitor to be checked out in order to use Oscilloscope to test it.
I ended up getting this universal component checker from Amazon for cheap, and it seems working ok.

Put the scope across the capacitor leads, observe the waveform being applied, and think about how that tester is using that to infer the capacitor's properties.

Then think about how you could have created an equivalent tester.

Such thought experiments are fun and useful.