Changes

:This first part will explain basic concepts of using strings, printing strings, and manipulating sub-strings. 

</source>:#Strings can contain any characters inside them, whether they are letters, numbers, or symbols. In our ipython3 shell the values inside each string variable can be seen just by typing the string variable name. However, when writing python scripts, these string variables should be placed inside '''print()''' functions in order to display on the screen.<br><br> Strings can also be concatenated(combined together) by using the '''+''' sign, just make sure string are only concatenating other strings(no lists, no numbers, no dictionaries, etc)<br><br>:#To demonstrate, issue the following:<source>