diff --git a/html.md b/html.md
index e924c9f..ca7438c 100644
--- a/html.md
+++ b/html.md
@@ -46,9 +46,6 @@ updated: 2020-06-17
 | `<a>..</a>`| Used to link external webpages to your web page| `<a href="https://onecompiler.com/" target="_blank"> OneCompiler</a>`|
 | `<img />`| Used to insert an image | `<img src="/sample.jpg" alt="sample image" width="100" height="50" longdesc="image" />`|
 |`<pre/>`| Text in a pre elementis displayed in a fixed-width font, and it preservesboth spaces and line breaks |`<pre> int i = 0; </pre>`|
-|`<audio>`| It is used to embed sound content in the document. |` <audio controls> <source src="demo.mp3" type="audio/mpeg"> </audio>`|
-|`<video>`| It is used to embed video in the webpage. |` <video width="480" height="320" controls> <source src="demo_move.mp4" type="video/mp4"> </video>`|
-
 
 
 ## HTML formatting 
@@ -82,6 +79,11 @@ updated: 2020-06-17
             <td>Row 2, Col 1</td>
             <td>Row 2, Col 2</td>
          </tr>
+     
+        <tr>
+            <td>Row 3, Col 1</td>
+            <td>Row 3, Col 2</td>
+         </tr>
          
    </table>
 ```
diff --git a/linux.md b/linux.md
index 117e66d..5fa0452 100644
--- a/linux.md
+++ b/linux.md
@@ -56,3 +56,30 @@ Options:
 -W 	# Verify a archive file 
 -r 	# update or add file or directory in already existed .tar file
 ```
+## System Info
+```sh
+date          # Show the current date and time
+cal           # Show this month's calender
+uptime        # Show current uptime
+w             # Display who is on line
+whoami        # Who you are logged in as
+finger user   # Display information about user
+uname -a      # Show kernel information
+man command   # Show the manual for command
+df            # Show the disk usage
+du            # Show directory space usage
+free          # Show memory and swap usage
+```
+
+## Shortcuts
+```sh
+ctrl+c       # Halts the current command
+ctrl+z       # Stops the current command, resume with fg in the foreground or bg in the background
+ctrl+d       # Logout the current session, similar to exit
+ctrl+w       # Erases one word in the current line
+ctrl+u       # Erases the whole line
+ctrl+r       # Type to bring up a recent command
+!!           # Repeats the last command
+exit         # Logout the current session
+```
+