What are some good techniques for dealing with general anxiety?

I am 30 years old and i have some major anxiety on a variety of issues. Sometimes I don’t even know what I am worried about. Most of the time though I worry about something going on in my life at the time, mistakes i have made or how I am going to be happy in life. Please help with any tips or advice you can give. This anxiety can ruin the whole day when i get it and consume my thoughts, and be depressing. I don’t think I need medication for it because I can still function and deal with it, I would just like to make it easier to deal with.