1 always use face moisturizer before putting any makeup on and make sure that it has some kind of SPF in it.
2 is making sure everything is blended in well. I hate when i see people with makeup on and they have harsh makeup lines and they forgot to blend their makeup into their neck. (we have all been there before when we forgot to blend in makeup to our neck)
I used to use a stippling brush and some times i still do, but lately i have been using a beauty blender. It is a sponge almost and you use our it to blend in your foundation and concealer in with it.
Some beauty blenders are not that must and i have even seen that walmart has carried them also. But as a DIY kinda gal that i am i found away to make it.
So you know the memory foam you use on your bed if you cut a small piece off of the bed you can use it as a beauty blender. I know sounds crazy but really it works call me crazy but i speak the truth. My husband and i just bought i new memory foam for our bed and i cut a square off the top of the bed where your pillow would go and made my own. If you have a used one and not new memory foam and you do want to make your own i would suggest to wash that piece with antibacterial soap before you put it on your face. But i use my homemade beauty blender all the time and you will see it works just as it would if i got it in the store.
I should be the spoke person for this beauty blender because honestly it work and before you use it make sure it is damp so you will get the best results.