The best tip for beginners is to be aware of the light intensity level and how it reaches food objects, and learn how to adjust accordingly.
1. Take photos under natural light from outside
Try not to use indoor lights or flash from your camera.
Don't feel limited to always having to take photos of food in the kitchen. Maybe the best morning light in your house is in the bedroom or in the living room in the afternoon.
3. Take it from a different angle
Some foods look prettier when photographed from above (like pizza), or from the side (burgers), or at a 45 degree angle (drinks). Try moving plates around and taking photos from several angles so that later you can choose the one you like most when editing. 
4. Minimize other goods/property
If a spoon, napkin or background that is too busy doesn't fit into the photo, it will really distract from your frame. Focus on the important things, but don't zoom in too close so viewers can't tell what the food is. 