Answers for "use slick slider custom arrow"

Slick slider arrows change

$(document).ready(function(){
        $('.slider').slick({
            autoplay:true,
            arrows: true,
            prevArrow:"<button type='button' class='slick-prev pull-left'><i class='fa fa-angle-left' aria-hidden='true'></i></button>",
            nextArrow:"<button type='button' class='slick-next pull-right'><i class='fa fa-angle-right' aria-hidden='true'></i></button>"
        });
    });

slick arrow css

.slick-prev:before {
  content: "<";
  color: red;
  font-size: 30px;
}

.slick-next:before {
  content: ">";
  color: red;
  font-size: 30px;
}