Switching to raised beds

I was planting perennials and small fruit trees in various parts of the yard, which was fine at the time but now I’ve been told to procure some “plant boxes” which I think means raised beds. Basically they want it contained for the new landscaping and to perhaps prevent whoever does the lawn from ending the plants (which has happened many times no matter how well they’re marked). I don’t know how to do this but I will try.

Is this feasible? I don’t want to do conventional gardening with all the “ingredients” bought from Lowe’s. What advice do you have?