Can I
1) Pick up apples from the garden?
2) Rake leaves to form a compost pile?
3) Gather peanuts that have fallen in the kitchen?
4) Gather cutlery that has fallen?
5) Pick up a bunch of cotton shirts that have fallen?
After reaping the cut stalks of produce were gathered and sheaved to be brought later to the threshing floor. Called the melacha of gathering.
Essentially it's the collecting or combining of scattered fruits, produce or any other substance that grows from the ground, it applies to even 2 fruits even of different varieties.
Additionally consolidating what has already been gathered such as compacting a mound of dates into a solid mass is also under gathering.
Some examples of this melacha:
1) stringing figs
2) gathering a bucket of apples
3) raking leaves to form a compost pile
You could pick up 1 fruit at a time and take into your house even though you will end up filling a container inside. Note, this is only where the fruits fell before shabbos! Otherwise are muktza under reaping (part 13).
4 exceptions to gathering:
1) the items must be earth grown, so cutlery can be gathered.
2) it must be gathered in its place of growth, so peanuts that scatter in the kitchen can be picked up.
However note that if indoors is the place that it's ordinarily packed or consolidated, such as stringing figs, it's not ok indoors.
3) regathering isn't gathering, so if a basket of tomatoes tipped over in a garden you can collect them as they were already gathered once before.
However if the fruits became scattered when they fell then for other reasons only do 2 or 3 at a time.
4) the objects must be in their original state, so wooden toys or cotton shirts can be gathered up even though from a material that in it's original state, gathering applies to.