Move & Selection Tools
Slicing and cutting Tools
Moving and zooming Tool
How to painting tools use in illustrator
Paintbrush tool (B)
The Paintbrush tool draws freehand and calligraphic lines, as well as art, patterns, and bristle brush strokes on paths. See Draw paths and apply brush strokes simultaneously .
Mesh tool (U)
The Mesh tool creates and edits meshes and mesh envelopes. See Create mesh objects.
Gradient tool (G)
The Gradient tool (G) adjusts the beginning and ending points and angle of gradients within objects, or applies a gradient to objects. See Apply a gradient to an object.
The Eyedropper tool (I) samples and applies color, type, and appearance attributes, including effects, from objects. See Copy appearance attributes using the Eyedropper tool.