cd is internal command for changing directories, what means something like browsing dirs by manualy typing cd with expressions
maybe you should look for some help in linux books
cd / - changes to root dir
cd .. - changes to previous dir
cd whatever - changes to whatever dir
you can also combine those like
cd /whatever - changes to whatever where whatever is in root dir
cd ../whatever - changes to whatever where whatever is one level up
cd ../../../../whatever - ...
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