I quite often get a freebie stew pack from work (reduced not sold) and make a mixed root mash for the freezer. It is a great standby.
As for gadgets - I have an old fashioned pressure cooker but I am a bit afraid of it
I must make an effort to use it more. My air-fryer is used a lot. I have to say it makes sublime croutons from a dash of oil, seasoning and any old stale bread you want to use up. Worth bearing in mind for all that soup