Preferably buy all food from the local farmers market. This will mean what you are eating is local, seasonal, and usually also cheaper than the organic foods at the supermarket.
Develop relationships with local farmers and become loyal customers. They will usually give you free food for coming back so often.
Wherever you go in life, it's vital to develop connections to local farmers and not rely on mega-corporation grocery stores.
Beware those that give grains, soy, antibiotics, or hormones to their animals. Seek out healthy pasture-raised animals grass-fed or wild caught for seafood.
If there are no farmers markets, then look to local co-ops or health stores that might source from local farmers.
This should go without saying, but beware any packaged food and always read the ingredient label. If there's any words you can't pronounce, then it's likely not natural.
Even beware the word "natural" on packaging. Many countries allow companies to call their drinks or food "naturally flavored" which is just code for synthetic additives or chemical reconstructions for what they think the natural flavor is identical to.
Always read the ingredients (5). This is what matters.
You can more or less ignore the calories, and macro/micronutrients. These are false notions.
In general, you want to be eating unadulterated whole foods. Processed foods go against this idea at a fundamental level.
The below would be what you call whole foods.
Now the below would be processed foods. Anything in a box or processed with other ingredients, it's safe to say it is not whole foods. Even the "healthy" plant-base, keto, protein packaged foods are not good. Just half-truth marketing trying to sell to health-conscious people who haven't figured it out yet.
Avoid eggs that have been refrigerated. Eggs lose many nutrients when refrigerated.
Must be raw unheated in glass. Only buy honey stored in glass. Any stored in plastic is not good honey. Be careful because many bigger brands call their honey raw but secretly heat their honey just a bit to increase their quantity. The same can be said for dates. Always local!
You can order things online but beware if they freeze meat. Befriend your local butcher or farm and become a good customer. They will usually reward you in the long run.
There are some sites where you can order cheese and ask them to not freeze it in the shipping details. Again some states/countries may outlaw raw milk. This is an unfortunate case of political tyranny telling people what and how they can eat.
Many small farmers get around this by labeling the raw milk as "For animal consumption" or "For pets only". Look around, do some research, and try your best.
Sometimes it not always possible to get raw dairy that's also 100% organic grass fed and grass finished. Do your best and settle for raw milk that's not organic or not 100% grass fed if you have to.