installing apps

[Spidey Knepscheld]

Hi Guys
 
This might be the silliest question on air but shit I need to know.If I
am not mistaken to install a new app I first need to update the ports
tree ?I don't know how to do that correctly then how do I get the
program and install it.If someone could perhaps just give me a
step-by-step on how to do that.I did try the man files but does not know
what page to start and so on.Please if one can help.
 
 
Spidey