Protein is the building block of muscle. Without enough of it the work you do in the gym doesn't translate into the results you want. A simple daily target is 0.7 to 1 gram of protein per pound of bodyweight. Build your meals around a protein source first and add everything else around it. Good sources: chicken, turkey, eggs, Greek yogurt, cottage cheese, fish, lean beef. Protein shakes can help you hit your target but they supplement real food, they don't replace it.

Undereating while trying to build strength is one of the most common mistakes beginners make. If you are consistently tired, not recovering well between sessions, or not getting stronger over time, there is a good chance you are not eating enough. Strength training requires fuel. Your body cannot build muscle in a significant deficit.

One bad meal does not ruin your progress. One perfect meal does not build your body. It is the pattern over weeks and months that determines your results. Stop looking for the perfect approach and start building the habit of eating mostly whole foods, mostly enough protein, and mostly in reasonable amounts.

Dehydration directly impairs performance, recovery, focus, and joint health. A simple daily target is half your bodyweight in ounces of water, which works out to roughly 1.5 to 2.5 liters depending on your size. If you train hard or sweat a lot, aim for the higher end.

Meal timing, detailed macro tracking, supplements, intermittent fasting. None of them matter until you have mastered eating enough protein, eating consistently, and staying hydrated. Build the foundation before you add complexity. The same principle that applies to your training applies here too.