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const sliderWrap = document.querySelector(".slider__wrap");
const sliderImg = document.querySelector(".slider__img"); //보여지는영역
const sliderInner = document.querySelector(".slider__inner"); //움직이는 영역
const slider = document.querySelectorAll(".slider"); //각각 이미지
const sliderDot = document.querySelector(".slider__dot");
let currentIndex = 0; //현재 이미지
let dotIndex = ""; // 닷
let sliderCount = slider.length; //이미지갯수
let sliderWidth = sliderImg.offsetWidth; //이미지 가로값
// 닷만들기
function init() {
    slider.forEach((e, i) => (dotIndex += "<a href='#'' class='dot'>이미지" + (i + 1) + "</a>"));
    sliderDot.innerHTML = dotIndex;
    //첫번째 닷버튼한테 활성화표시
    sliderDot.firstChild.classList.add("active");
}
init();
//이미지 움직이는 영역
function gotoSlider(num) {
    sliderInner.style.transition = "all 400ms";
    sliderInner.style.transform = "translateX(" + -sliderWidth * num + "px)";
    let sliderDotActive = document.querySelectorAll(".slider__dot .dot");
    sliderDotActive.forEach((el) => el.classList.remove("active"));
    sliderDot.children[num].classList.add("active");
    currentIndex = num;
}
//버튼클릭했을때
document.querySelectorAll(".slider__btn a").forEach((btn, index) => {
    btn.addEventListener("click", () => {
        let prevIndex = (currentIndex + sliderCount - 1) % sliderCount;
        let nextIndex = (currentIndex + 1) % sliderCount;
        if (btn.classList.contains("prev")) {
            gotoSlider(prevIndex);
        } else {
            gotoSlider(nextIndex);
        }
    });
});
//닷버튼 클릭했을때
document.querySelectorAll(".slider__dot .dot").forEach((e, i) => {
    e.addEventListener("click", () => {
        gotoSlider(i);
    });
});

<main id="main">
    <section id="sliderType04">
        <div class="slider__wrap">
            <div class="slider__img">
                <div class="slider__inner">
                    <div class="slider"><img src="../assets/img/effect_bg11@2x.jpg" alt="동물사진" /></div>
                    <div class="slider"><img src="../assets/img/effect_bg12@2x.jpg" alt="동물사진" /></div>
                    <div class="slider"><img src="../assets/img/effect_bg13@2x.jpg" alt="동물사진" /></div>
                    <div class="slider"><img src="../assets/img/effect_bg14@2x.jpg" alt="동물사진" /></div>
                    <div class="slider"><img src="../assets/img/effect_bg15@2x.jpg" alt="동물사진" /></div>
                </div>
            </div>
            <div class="slider__btn">
                <a href="#" class="prev">prev</a>
                <a href="#" class="next">next</a>
            </div>
            <div class="slider__dot">
            </div>
        </div>
    </section>
</main>

/* slider */
.slider__wrap {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
/* 이미지 보이는 영역 */
.slider__img {
    position: relative;
    height: 450px;
    width: 800px;
    overflow: hidden;
}
/* 이미지를 감싸고 있는 부모 : 움직이는 부분 */
.slider__inner {
    display: flex;
    flex-wrap: wrap;
    width: 4800px;
    height: 450px;
}
/* 개별적인 이미지 */
.slider {
    position: relative;
    width: 800px;
    height: 450px;
}
.slider::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 5px;
    background: rgba(0, 0, 0, 0.4);
    color: #fff;
    padding: 5px 10px;
}
.slider:nth-child(1)::before {
    content: "이미지1";
}
.slider:nth-child(2)::before {
    content: "이미지2";
}
.slider:nth-child(3)::before {
    content: "이미지3";
}
.slider:nth-child(4)::before {
    content: "이미지4";
}
.slider:nth-child(5)::before {
    content: "이미지5";
}
.slider:nth-child(6)::before {
    content: "이미지1";
}

@media (max-width: 800px) {
    .slider__img {
        width: 400px;
        height: 260px;
    }
}
.slider__btn {
}
.slider__btn a {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: rgba(0, 0, 0, 0.4);
    text-align: center;
    line-height: 50px;
    transition: all 0.2s;
    display: block;
    color: #fff;
}
.slider__btn a:hover {
    background: rgba(0, 0, 0, 0.8);
}
.slider__btn a.prev {
    left: 0;
}
.slider__btn a.next {
    right: 0;
}
.slider__dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 20px;
}
.slider__dot .dot {
    width: 20px;
    height: 20px;
    background: rgba(0, 0, 0, 0.4);
    display: inline-block;
    border-radius: 50%;
    margin: 2px;
    text-indent: -9999px;
    transition: all 0.4s;
}
.slider__dot .dot.active {
    background: rgba(255, 255, 255, 0.9);
}