makeup help

so i got a question for those of you that do makeup. how do u make ur foundation not look cakey or blotchy? with or without primer, use of a sponge or brush, my foundation looks the same. im not sure if it's the foundation im using and i really hope it's not since it's the only one that matches my skin tone (fenty beauty shade 100 haha #palebluegang)

any help or tricks are greatly appreciated. x