It is good to be charitable.
Lucas has a bunch of things in his attic that he isn't using.
Lucas wants to decide what to do with them that they are wasting space.
Lucas decides to give these things away to people who might want them.
Lucas throws it all in the trash and then into the dumpster where it will all be taken to the dump.
Lucas is happy that other people will go on to enjoy his old things.
Lucas is glad his attic is finally empty of clutter now.