I made my first SWOT but how do I know I did not miss anything?

In the coming days you will probably think “oh I should have listed that as well”. Fine you can do that, just add it to your notebook. In lesson 13 you will make a more final SWOT and even than you can still add to it later on. You change and the world around you changes. The SWOT is a great guide but it is not set in concrete. Best is to make one every year. And when drastic events occur (like Covid-19 for instance) updating your SWOT is very helpful to give you direction.