List group 
List groups are a flexible and powerful component for displaying a series of content. Modify and extend them to support just about any content within.
Basic example
The most basic list group is an unordered list with list items and the proper classes. Build upon it with the options that follow, or with your own CSS as needed.
Active items
Add 
.active
 to a 
.list-group-item
 to indicate the current active selection.
Disabled items
Add 
.disabled
 to a 
.list-group-item
 to make it appear disabled. Note that some elements with 
.disabled
 will also require custom JavaScript to fully disable their click events (e.g., links).
Links and buttons
Use <a>s or <button>s to create actionable list group items with hover, disabled, and active states by adding .list-group-item-action. We separate these pseudo-classes to ensure list groups made of non-interactive elements (like <li>s or <div>s) donÂ’t provide a click or tap affordance.
Be sure to not use the standard .btn classes here.
Numbered
Add the .list-group-numbered modifier class (and optionally use an <ol> element) to opt into numbered list group items. Numbers are generated via CSS (as opposed to a <ol>s default browser styling) for better placement inside list group items and to allow for better customization.
Numbers are generated by counter-reset on the <ol>, and then styled and placed with a ::before pseudo-element on the <li> with counter-increment and content.

Example:


Output:

  • An item
  • A second item
  • A third item
  • A fourth item
  • And a fifth one


  • An active item
  • A second item
  • A third item
  • A fourth item
  • And a fifth one


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How we categorized software development in different manner.

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We cover all the programming concepts in various programming languages, this tutorials are very help full for bigener as well as Experience developer, for the ease of understanding we categorized programming in different manner likewise.