Answer:
Some will use me, others not. Some have remembered, others forgot. For profit or gain, I'm used expertly. I can't be picked off the ground or tossed into the sea. What am I?
I am the kind of nut that is empty at the center and has no shell.
You went into the woods and got me. You sat down to seek me. You brought me home because you couldn't find me.
Everyone in the world needs me. They generously give me but never take me. What am I?
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.