How to use "in on at" while framing sentences

Let's learn how to use prepositions in, on, and at.

At: At shows us the location of a person or thing.

1. Am at home
2. Am at work
3. Am at theater

In: In shows us something inside.

1. There are two pens in the draw.
2. I read an interesting article in the newspaper.
3. I like action scenes in movies.

On: A thing is top on something.

1. There is dust on the floor.
2. Mick-Mouse is my best cartoons on TV.
3. I like listening to talk shows on radio. 

Optimists Vs Pessimists

Optimists tend to think on a good side of life and have lots of hoping in future. Pessimists have negative opinion towards all the activities they do.

Example with a glass with water filled to the half:

                  Optimists                                        Pessimists

Positive thinking                                                  Negative thinking
Expects positive out of any activity                     Rolls in negativity all the time
An Optimist feels happy to have half filled.        A Pessimist sees a half-empty.

Here is "en route" meaning!

en route: During the course of a journey or on the way.

This word is used rarely, who are good at English would understand meaning of it, others may feel it a typing error.

Example: Your tasty food is en route. This message you often see on your food apps.