How to cd to a directory with a name containing spaces in bash?
You can use the Tab key after pressing the first few characters (this will then "fill in" the rest of the folder for you e.g. type cd ~/LTab fills in cd ~/Library/ then type ApTab and it will fill in the rest for you.

If there is a space between words and you don't want to use the methods above, put a \ (backslash) before the space, e.g. cd ~/Library/Application\ Support.