With low-carb you forget about calorie counting.
You cut out all refined sugar, honey, agave and sugar substitutes. You cut out bread, rice, floury potatoes, flour, cake, biscuits, sweets and puddings.
Some people find that "low GI" carbs like quinoa, pearl barley and wild rice help the transition.
You cut out most processed food to avoid hidden sugars. Avoid anything with "low-fat".
You can (and should) eat moderate amounts of fat, olive oil, butter, full-fat yoghurt, cheese and meat.
You eat plenty of protein - meat, fish, eggs etc.
You eat lots of vegetables especially those that grow above the ground. You can make courgette spaghetti, cauliflour mash and celeriac chips, to name but a few possible substitutes.
You eat fruit but avoid tropical fruits. Berries are best.
You avoid sweet drinks; some people avoid alcohol completely, but we have stuck with a couple of glasses of dry wine a few times a week.
You can also have a small square of dark chocolate from time to time.
I think that's it!