Looking to start prepping my lunches

Hi, I’m a landscaper, so I don’t have access to a microwave. I’m looking to pack my lunches more often to save on costs and eat a bit healthier. I have a thermos, so can heat some food up before I leave for work. And I have containers for cold meals. .

Can you kind people please steer me towards great websites or YouTubers to help me find some ideas and recipes?

Thanks!