Nanning, IMO gardening is an intervention . It can be a benefit to both you and nature depending upon how you do it.
Grass around your potatoes may not seem like a problem when the grass is small but it will grow and compete with the potatoes for light and nutrients. There are several options, black plastic sheet that covers the ground and blocks sunlight except where holes in plastic allow your potatoes to grow, a thick layer of well cooked compost that also blocks the sunlight , manual control ( a hoe or hand weeding ) ,
gmo seed and roundup, or a pre-emergent spray and greenhouse seedlings, or years and years of meticulous weed control and reduced seed in the soil. They are all interventions you just get to choose how much labor you want to put into your preferred method.
The only non intervention is foraging wild plants but then again you will be competing with something else that would eat what you collect. We living things compete for food, or light, or nutrients. Your choice is how to grow a garden and still allow nature it’s place. The wild animals love my garden so I fence off the large critters that can do the most damage, like deer but I plant more than I need so a bunny or two, or moles, or even a few pocket gofers can eat without crashing all my efforts. I have badgers that can and have eaten whole corn crops. I have some years lost almost all my corn but I refuse to trap or kill them. I plant a variety of crops , for several reasons, but I plant allot so I always get enough.
I think you will find gardening very frustrating if you allow every last living thing to take what it wants or every weed to flourish.
You have to make choices about what you want as your share and what you are willing to share with nature . Hard choices but maybe better to think of balance rather than dominance.
Pull or hoe grass and weeds when very small or their roots will grow and make your work much, much more difficult. You need to have a yield at the end of the year or gardening will prove discouraging .
Don’t fret too much over failures, just remember what works well and replete next season. Try not to replete failed crops too many times. Some things will flourish , remember your timing, your seed choices, and what weather resulted in success. All gardeners suffer some failures but beginner gardeners sometimes don’t realize the years of failure that successful gardeners have already endured.
It takes a lifetime.
ps, don’t dick with the bottom leaves on your tomato transplants. Cold , damp conditions are hell on tomatoes so a drought and some more heat may result in a good year for them, don’t get water on the plants themselves.