With cd .. you can navigate one directory up from the one you are at now. If you use that a lot, consider some handy aliases.

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Add the following lines to your ~/.bashrc:

alias ..="cd .."
alias ...="cd ../.."
alias ....="cd ../../.."
alias .....="cd ../../../.."
alias ......="cd ../../../../.."

you can add even more aliases, but I usually loose track after too many levels and just jump to the directly directly, e.g. using its absolute path or its bookmark (see this card).

Example usage:

>pwd
/home/judith
>cd Projects/makandra-cards/
./Projects/makandra-cards/
>pwd
/home/judith/Projects/makandra-cards
>...
>pwd
/home/judith

This will be most helpful if you are forced to work in deeply nested directories (e.g. projects with such a structure).