Making grape fruits in blender

This is a good beginner tutorial as it introduces key parts of blender that are used for different things, we shall look at using the particle system particularly the hair system, modifiers and a few modeling techniques.

Key steps in modeling a grape fruit

First add a plane, in edit mode select all vertices and merge then into one,
extrude this vertex into a brunch looking stick that will hold the grapes
select the tips of each brunch and create a new vertex group, we only the grapes to be at the tips
assign the selected vertices to the vertex group you created
navigate to the particle system and add a new hair particle system
change the source emit from option to vertices, so the hair particles can show
you can also check advanced to get more settings, to control the rotation,
in the rotation settings which will only be available if you have advanced on, change orientation to normal and add some randomization
in the particle render setting switch from path to object we now need a grape model to be our particle instance
you can model a single grape from a cylinder or subdivided cube,
you can also randomize the scale of each instance using the random scale option in the particle render setting
now lets give some thickness to our stick, go to the modifiers and add a skin modifier
if you want to reduce the radius of the stick, select all vertices or the vertex you want to change and use Ctrl + A to adjust the radius

Key modifiers used

Skin modifier to easily add skin or thickness to the grape brunch/stick
subdivision surface to smooth the stick
particle system to instance the grapes on the stick

key shortcuts used:

Ctrl+ A: when you have a skin modifier on an object in edit mode this short cut will let you adjust the thickness of the skin
Ctrl + LMB: when you have a vertex selected, you can extrude it to the clicked area