Will inflation ever be a good thing? Or is it always a bad thing? Like, I wouldn't really want my food to be increasing in prices...

Some inflation is always a good thing. It shows a growing economy.

But too much is bad, shows a lack of fiscal policy and deflation (or negative inflation) is bad too, shows that the economy is slowing down and people get worried that companies and countries aren't making enough profits. They might lose their jobs, foreign investments pull out, etc.