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

Code Example 1

<div class="form-group">
    <label for="exampleFormControlTextarea1">Example textarea</label>
    <textarea class="form-control" id="exampleFormControlTextarea1" rows="3">

Code Example 2

<div class="form-group">
  <label for="exampleFormControlTextarea3">Rounded corners</label>
  <textarea class="form-control" id="exampleFormControlTextarea3" rows="7">

Code Example 3

<div class="form-check form-check-inline">
      <input id="checkbox3" type="checkbox" checked="checked">
      <label for="checkbox3">Checkbox checked</label>
    </div>

Code Example 4

<div class="input-group">
  <div class="input-group-prepend">
    <span class="input-group-text" id="">First and last name</span>
  </div>
  <input type="text" class="form-control">
  <input type="text" class="form-control">
</div>

Code Example 5

<div class="form-check form-check-inline">
  <input class="form-check-input" type="checkbox" id="inlineCheckbox1" value="option1">
  <label class="form-check-label" for="inlineCheckbox1">1</label>
</div>
<div class="form-check form-check-inline">
  <input class="form-check-input" type="checkbox" id="inlineCheckbox2" value="option2">
  <label class="form-check-label" for="inlineCheckbox2">2</label>
</div>
<div class="form-check form-check-inline">
  <input class="form-check-input" type="checkbox" id="inlineCheckbox3" value="option3" disabled>
  <label class="form-check-label" for="inlineCheckbox3">3 (disabled)</label>
</div>

Code Example 6

<div class="form-group">
    <label for="exampleFormControlSelect1">Example select</label>
    <select class="form-control" id="exampleFormControlSelect1">
      <option>1</option>
      <option>2</option>
      <option>3</option>
      <option>4</option>
      <option>5</option>
    </select>
  </div>
  <div class="form-group">
    <label for="exampleFormControlSelect2">Example multiple select</label>
    <select multiple class="form-control" id="exampleFormControlSelect2">
      <option>1</option>
      <option>2</option>
      <option>3</option>
      <option>4</option>
      <option>5</option>
    </select>
  </div>

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