I need an unordered list without any bullets

You can remove bullets by setting the list-style-type to none on the CSS for the parent element (typically a <ul>), for example:

ul {
  list-style-type: none;
}

You might also want to add padding: 0 and margin: 0 to that if you want to remove indentation as well.

See Listutorial for a great walkthrough of list formatting techniques.

You need to use list-style: none;

<ul style="list-style: none;">
    <li>...</li>
</ul>

To completely remove the ul default style:

    list-style-type: none;

    margin: 0;
    margin-block-start: 0;
    margin-block-end: 0;
    margin-inline-start: 0;
    margin-inline-end: 0;
    padding-inline-start: 0;

If you are developing an existing theme, it's possible that the theme has a custom list style.

So if you cant't change the list style using list-style: none; in ul or li tags, first check with !important, because maybe some other line of style is overwriting your style. If !important fixed it, you should find a more specific selector and clear out the !important.

li {
    list-style: none !important;
}

If it's not the case, then check the li:before. If it contains the content, then do:

li:before {
    display: none;
}

ul{list-style-type:none;}

Just set the style of unordered list is none.

You can hide them using ::marker pseudo-element.

1. Transparent ::marker

ul li::marker {
  color: transparent;
}

ul li::marker {
  color: transparent;
}

ul {
  padding-inline-start: 10px; /* Just to reset the browser initial padding */
}

<ul>
  <li> Bullets are bothersome </li>
  <li> I want to remove them. </li>
  <li> Hey! ::marker to the rescue </li>
</ul>

2. ::marker empty content

ul li::marker {
  content: "";
}

ul li::marker {
   content: "";
}

<ul>
  <li> Bullets are bothersome </li>
  <li> I want to remove them </li>
  <li> Hey! ::marker to the rescue </li>
</ul>

It is better when you need to remove bullets from a specific list item.

ul li:nth-child(n)::marker { /* Replace n with the list item's position*/
   content: "";
}

ul li:not(:nth-child(2))::marker {
   content: "";
}

<ul>
  <li> Bullets are bothersome </li>
  <li> But I can live with it using ::marker </li>
  <li> Not again though </li>
</ul>

 <div class="custom-control custom-checkbox left">
    <ul class="list-unstyled">
        <li>
         <label class="btn btn-secondary text-left" style="width:100%;text-align:left;padding:2px;">
           <input type="checkbox" style="zoom:1.7;vertical-align:bottom;" asp-for="@Model[i].IsChecked" class="custom-control-input" /> @Model[i].Title
         </label>
        </li>
     </ul>
</div>

I tried and observed:

header ul {
   margin: 0;
   padding: 0;
}