How can you rank for a Niche without mentioned keywords in Description ?

[jihane123]

I am new to the App Store business , or Reskin to be more sepecific and honest . I don't have enough money to promote my app but I heard of some great tools in order to rank in top for a particular niche , without mentioning any keywords in the description desription . Any help is apperciated , thanks in advanced :-*:-*:-* .