Check out example codes for "bootstrap Checkbox buttons". It will help you in understanding the concepts better.

Code Example 1

Bootstrap’s .button styles can be applied to other elements, such as 
<label>s, to provide checkbox or radio style button toggling. Add 
data-toggle="buttons" to a .btn-group containing those modified buttons 
to enable their toggling behavior via JavaScript and add .btn-group-toggle
to style the <input>s within your buttons. Note that you can create single 
input-powered buttons or groups of them.

The checked state for these buttons is only updated via click event on the
button. If you use another method to update the input—e.g., with 
<input type="reset"> or by manually applying the input’s checked 
property—you’ll need to toggle .active on the <label> manually.

Note that pre-checked buttons require you to manually add the .active class
to the input’s <label>.

<div class="btn-group btn-group-toggle" data-toggle="buttons">
  <label class="btn btn-secondary active">
    <input type="radio" name="options" id="option1" checked> Active
  </label>
  <label class="btn btn-secondary">
    <input type="radio" name="options" id="option2"> Radio
  </label>
  <label class="btn btn-secondary">
    <input type="radio" name="options" id="option3"> Radio
  </label>
</div>

Code Example 2

<div class="btn-group btn-group-toggle" data-toggle="buttons">
  <label class="btn btn-secondary active">
    <input type="radio" name="options" id="option1" autocomplete="off" checked> Active
  </label>
  <label class="btn btn-secondary">
    <input type="radio" name="options" id="option2" autocomplete="off"> Radio
  </label>
  <label class="btn btn-secondary">
    <input type="radio" name="options" id="option3" autocomplete="off"> Radio
  </label>
</div>

Code Example 3

<div class="form-check form-check-inline">
  <input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio1" value="option1">
  <label class="form-check-label" for="inlineRadio1">1</label>
</div>
<div class="form-check form-check-inline">
  <input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio2" value="option2">
  <label class="form-check-label" for="inlineRadio2">2</label>
</div>
<div class="form-check form-check-inline">
  <input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio3" value="option3" disabled>
  <label class="form-check-label" for="inlineRadio3">3 (disabled)</label>
</div>

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