4 Hour Chef by Tim Ferriss is a pretty decent book on basic cooking in a lowish carb vein.
Twenty by Michael Ruhlman is also a pretty solid cookbook for folks who don’t cook much but would like to cook more. It is not especially low carb, but it’s about technique.
I make a lot of food on Sunday, when I have a lot of loose time around the house. I package in tupperware and bring to work in deli containers. A three lbs chuck roast made as a simple braised pot roast is 6 protein servings through the week. Maybe 3 lunches and a dinner or two (as the wife will consume 1-2 servings). Just need a pot, a roast, some stock or bone broth (same diff), and maybe a shallot or some mushrooms. We make a pound of green beans on the weekend, or asparagus, or whatever. I’m a bit picky, so not too many veg in my wheelhouse. But that’s a bunch of servings for the week, and use of the microwaves at work and at home.
As to canned meats… check the labels, but generally tuna, salmon, anchovies, packed in water, olive oil, or their own oil are fine. Flavored, packed in canola or veg oil, more circumspect. Sugar and it’s ~47 forms should be listed on ingredients. Starch and it’s ~1000 label names as well.