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

Code Example 1

Due to the widespread use of tables across third-party widgets like 
calendars and date pickers, we’ve designed our tables to be opt-in. 
Just add the base class .table to any <table>, then extend with custom 
styles or our various included modifier classes.

Using the most basic table markup, here’s how .table-based tables 
look in Bootstrap. All table styles are inherited in Bootstrap 4,
meaning any nested tables will be styled in the same manner as the parent.

<table class="table table-dark">
  <thead>
    <tr>
      <th scope="col">#</th>
      <th scope="col">First</th>
      <th scope="col">Last</th>
      <th scope="col">Handle</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">1</th>
      <td>Mark</td>
      <td>Otto</td>
      <td>@mdo</td>
    </tr>
    <tr>
      <th scope="row">2</th>
      <td>Jacob</td>
      <td>Thornton</td>
      <td>@fat</td>
    </tr>
    <tr>
      <th scope="row">3</th>
      <td>Larry</td>
      <td>the Bird</td>
      <td>@twitter</td>
    </tr>
  </tbody>
</table>

Code Example 2

<table class="table">
  <thead class="thead-dark">
    <tr>
      <th scope="col">#</th>
      <th scope="col">First</th>
      <th scope="col">Last</th>
      <th scope="col">Handle</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">1</th>
      <td>Mark</td>
      <td>Otto</td>
      <td>@mdo</td>
    </tr>
    <tr>
      <th scope="row">2</th>
      <td>Jacob</td>
      <td>Thornton</td>
      <td>@fat</td>
    </tr>
    <tr>
      <th scope="row">3</th>
      <td>Larry</td>
      <td>the Bird</td>
      <td>@twitter</td>
    </tr>
  </tbody>
</table>

<table class="table">
  <thead class="thead-light">
    <tr>
      <th scope="col">#</th>
      <th scope="col">First</th>
      <th scope="col">Last</th>
      <th scope="col">Handle</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">1</th>
      <td>Mark</td>
      <td>Otto</td>
      <td>@mdo</td>
    </tr>
    <tr>
      <th scope="row">2</th>
      <td>Jacob</td>
      <td>Thornton</td>
      <td>@fat</td>
    </tr>
    <tr>
      <th scope="row">3</th>
      <td>Larry</td>
      <td>the Bird</td>
      <td>@twitter</td>
    </tr>
  </tbody>
</table>

Code Example 3

<table class="table">
  <thead>
    <tr>
      <th scope="col">#</th>
      <th scope="col">First</th>
      <th scope="col">Last</th>
      <th scope="col">Handle</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">1</th>
      <td>Mark</td>
      <td>Otto</td>
      <td>@mdo</td>
    </tr>
    <tr>
      <th scope="row">2</th>
      <td>Jacob</td>
      <td>Thornton</td>
      <td>@fat</td>
    </tr>
    <tr>
      <th scope="row">3</th>
      <td>Larry</td>
      <td>the Bird</td>
      <td>@twitter</td>
    </tr>
  </tbody>
</table>

Code Example 4

<!-- BOOTSTRAP V5 -->
<table class="table">
  <thead>
    <tr>
      <th scope="col">#</th>
      <th scope="col">First</th>
      <th scope="col">Last</th>
      <th scope="col">Handle</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">1</th>
      <td>Mark</td>
      <td>Otto</td>
      <td>@mdo</td>
    </tr>
    <tr>
      <th scope="row">2</th>
      <td>Jacob</td>
      <td>Thornton</td>
      <td>@fat</td>
    </tr>
    <tr>
      <th scope="row">3</th>
      <td colspan="2">Larry the Bird</td>
      <td>@twitter</td>
    </tr>
  </tbody>
</table>

Code Example 5

Bootstrap Basic Table
A basic Bootstrap table has a light padding and only horizontal dividers.

The .table class adds basic styling to a table
------------------------------------------------------------
Striped Rows
The .table-striped class adds zebra-stripes to a table

Bordered Table
The .table-bordered class adds borders on all sides of the table and cells
------------------------------------------------------------
Hover Rows
The .table-hover class adds a hover effect (grey background color) on table rows
------------------------------------------------------------
Condensed Table
The .table-condensed class makes a table more compact by cutting cell padding in half
------------------------------------------------------------
Contextual Classes
Contextual classes can be used to color table rows (<tr>) or table cells (<td>)

The contextual classes that can be used are:

Class		Description
.active		Applies the hover color to the table row or table cell
.success	Indicates a successful or positive action
.info		Indicates a neutral informative change or action
.warning	Indicates a warning that might need attention
.danger		Indicates a dangerous or potentially negative action
------------------------------------------------------------
Responsive Tables
The .table-responsive class creates a responsive table. The table will then scroll horizontally on small devices (under 768px). When viewing on anything larger than 768px wide, there is no difference

Sample code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h2>Bootstrap Table Example</h2>
  <table class="table -----------">  // try by adding different table class at this place => ("-----------")
    <thead>
      <tr>
        <th>Id</th>
        <th>Name</th>
        <th>Age</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>1</td>
        <td>Ram</td>
        <td>10</td>
      </tr>
      <tr>
        <td>2</td>
        <td>Shyam</td>
        <td>12</td>
      </tr>
      <tr>
        <td>3</td>
        <td>Ramesh</td>
        <td>13</td>
      </tr>
      <tr>
        <td>4</td>
        <td>Suresh</td>
        <td>11</td>
      </tr>
    </tbody>
  </table>
</div>

</body>
</html>

Code Example 6

<table class="table table-striped">
  <thead>
    <tr>
      <th scope="col">#</th>
      <th scope="col">First</th>
      <th scope="col">Last</th>
      <th scope="col">Handle</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">1</th>
      <td>Mark</td>
      <td>Otto</td>
      <td>@mdo</td>
    </tr>
    <tr>
      <th scope="row">2</th>
      <td>Jacob</td>
      <td>Thornton</td>
      <td>@fat</td>
    </tr>
    <tr>
      <th scope="row">3</th>
      <td>Larry</td>
      <td>the Bird</td>
      <td>@twitter</td>
    </tr>
  </tbody>
</table>

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