diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -5,8 +5,116 @@
 ![bubble](https://user-images.githubusercontent.com/78089013/167689895-ba7e3ddd-6ea9-41e0-8767-0700b12b6664.gif)
 
 ## Insertion Sort
-### To-Do:
-<li> add counting </li>
-<li> fix gap </li>
 
-![Insertion](https://user-images.githubusercontent.com/78089013/169668707-01f2b6a7-39e5-4670-9123-cc8d3777ef84.gif)
+![Inerstio](https://user-images.githubusercontent.com/78089013/170041841-1c114899-1ada-4278-9865-6939774f373f.gif)
+
+## Big O
+
+<table>
+    <tr>
+      <th>Algorithm</th>
+      <th colspan="3">Time Complexity</th>
+      <th>Space Complexity</th>
+    </tr>
+    <tr>
+      <th></th>
+      <th>Best</th>
+      <th>Average</th>
+      <th>Worst</th>
+      <th>Worst</th>
+    </tr>
+    <tr>
+      <td><a href="http://en.wikipedia.org/wiki/Quicksort">Quicksort</a></td>
+      <td><code class="orange">
+        Ω(n log(n))</code>
+      </td>
+      <td><code class="orange">Θ(n log(n))</code></td>
+      <td><code class="orange">O(n^2)</code></td>
+      <td><code class="orange">O(log(n))</code></td>
+    </tr>
+    <tr>
+      <td><a href="http://en.wikipedia.org/wiki/Merge_sort">Mergesort</a></td>
+      <td><code class="orange">Ω(n log(n))</code></td>
+      <td><code class="orange">Θ(n log(n))</code></td>
+      <td><code class="orange">O(n log(n))</code></td>
+      <td><code class="yellow">O(n)</code></td>
+    </tr>
+    <tr>
+      <td><a href="http://en.wikipedia.org/wiki/Timsort">Timsort</a></td>
+      <td><code class="yellow">Ω(n)</code></td>
+      <td><code class="orange">Θ(n log(n))</code></td>
+      <td><code class="orange">O(n log(n))</code></td>
+      <td><code class="yellow">O(n)</code></td>
+    </tr>
+    <tr>
+      <td><a href="http://en.wikipedia.org/wiki/Heapsort">Heapsort</a></td>
+      <td><code class="orange">Ω(n log(n))</code></td>
+      <td><code class="orange">Θ(n log(n))</code></td>
+      <td><code class="orange">O(n log(n))</code></td>
+      <td><code class="green">O(1)</code></td>
+    </tr>
+    <tr>
+      <td><a href="http://en.wikipedia.org/wiki/Bubble_sort">Bubble Sort</a></td>
+      <td><code class="yellow">Ω(n)</code></td>
+      <td><code class="red">Θ(n^2)</code></td>
+      <td><code class="red">O(n^2)</code></td>
+      <td><code class="green">O(1)</code></td>
+    </tr>
+    <tr>
+      <td><a href="http://en.wikipedia.org/wiki/Insertion_sort">Insertion Sort</a></td>
+      <td><code class="yellow">Ω(n)</code></td>
+      <td><code class="red">Θ(n^2)</code></td>
+      <td><code class="red">O(n^2)</code></td>
+      <td><code class="green">O(1)</code></td>
+    </tr>
+    <tr>
+      <td><a href="http://en.wikipedia.org/wiki/Selection_sort">Selection Sort</a></td>
+      <td><code class="red">Ω(n^2)</code></td>
+      <td><code class="red">Θ(n^2)</code></td>
+      <td><code class="red">O(n^2)</code></td>
+      <td><code class="green">O(1)</code></td>
+    </tr>
+    <tr>
+      <td><a href="https://en.wikipedia.org/wiki/Tree_sort">Tree Sort</a></td>
+      <td><code class="orange">Ω(n log(n))</code></td>
+      <td><code class="orange">Θ(n log(n))</code></td>
+      <td><code class="red">O(n^2)</code></td>
+      <td><code class="yellow">O(n)</code></td>
+    </tr>
+    <tr>
+      <td><a href="http://en.wikipedia.org/wiki/Shellsort">Shell Sort</a></td>
+      <td><code class="orange">Ω(n log(n))</code></td>
+      <td><code class="red">Θ(n(log(n))^2)</code></td>
+      <td><code class="red">O(n(log(n))^2)</code></td>
+      <td><code class="green">O(1)</code></td>
+    </tr>
+    <tr>
+      <td><a rel="tooltip" title="Only for integers. k is a number of buckets" href="http://en.wikipedia.org/wiki/Bucket_sort">Bucket Sort</a></td>
+      <td><code class="green">Ω(n+k)</code></td>
+      <td><code class="green">Θ(n+k)</code></td>
+      <td><code class="red">O(n^2)</code></td>
+      <td><code class="yellow">O(n)</code></td>
+    </tr>
+    <tr>
+      <td><a rel="tooltip" title="Constant number of digits 'k'" href="http://en.wikipedia.org/wiki/Radix_sort">Radix Sort</a></td>
+      <td><code class="green">Ω(nk)</code></td>
+      <td><code class="green">Θ(nk)</code></td>
+      <td><code class="green">O(nk)</code></td>
+      <td><code class="yellow">O(n+k)</code></td>
+    </tr>
+    <tr>
+      <td><a rel="tooltip" title="Difference between maximum and minimum number 'k'" href="https://en.wikipedia.org/wiki/Counting_sort">Counting Sort</a></td>
+      <td><code class="green">Ω(n+k)</code></td>
+      <td><code class="green">Θ(n+k)</code></td>
+      <td><code class="green">O(n+k)</code></td>
+      <td><code class="yellow">O(k)</code></td>
+    </tr>
+    <tr>
+      <td><a href="https://en.wikipedia.org/wiki/Cubesort">Cubesort</a></td>
+      <td><code class="yellow">Ω(n)</code></td>
+      <td><code class="orange">Θ(n log(n))</code></td>
+      <td><code class="orange">O(n log(n))</code></td>
+      <td><code class="yellow">O(n)</code></td>
+   </tr>
+
+</table>