Something you can build...
a building or technology
Something you can learn...
a language, skill or habit
Something you can discover
Something never seen before
Something you can invent...
anything that doesn't already exist
Something you can win...
a competition, contest or game
Something you can design...
something you can plan to make
Something you can protect
an animal or person in danger
Something you can study...
a course, class, language, subject or skill