Prep your skin beforehand. Moisturise well and then use a primer, personal favs are Benefit Porefessional or Too Faced Hangover primer.
When applying foundation, I pump 1-2 pumps of foundation onto my finger and dot it on my face rather than squirting the foundation directly onto my face (this way you're not using too much product and avoids looking and feeling cakey). If you need more coverage you can pump out more product and add it to the areas where you need more coverage.
I prefer using a beauty blender and spend a good few minutes blending out my foundation. I'll add a drop of Farsali Rose Gold oil whilst blending out my foundation to ensure it doesn't cling onto dry patches.
A few things really make sure ur using the correct moisturiser u should be able to get advice on this from where u buy it, try using a primer, blend ur foundation with a damp beauty blender and don’t apply to much foundation in one go build it up if u need to hope this helps 😊