If a serious disaster happened, what skills do you think are necessary to sustain yourself?

Question by Tracker Jacker: If a serious disaster happened, what skills do you think are necessary to sustain yourself?
For this scenario, let’s agree that this disaster is worldwide and that it is not going to be made better again for a very long time (will take generations to rebuild).

In a community of people however large, what skills would you think would be highly valuabe? Out of necessity? Out of want?

I’ve already thought of agriculture, glass blowing, clothing mending/making, raising livestock, building sustainable homes- but what else can you think of?

Can you help? Leave your own answer in the comments!