Let's draw banana with following procedure. But first, you may find a reference to achieve better result.
1. imagine you cut banana into pieces. Lightly draw that pieces without separating each other
2. trace the outline with bold line or pen
3. add curve in the middle

4. fill it with yellow as main color
5. pick light yellow and dark, brush lower side with darker yellow, and bright yellow for the upper to add some light. Challenge yourself to draw two or more bananas.