Prepositions Some common rules to use ‘AT’ and ‘IN’:-
At: Use it to point out specific time:
She will meet him at 2 p.m.
The train will arrive at 6:00 p.m.
Use it to indicate a place:
The meeting is at the conference room.
There were thousands of people at the concert.
She saw cricket game at the stadium.
Use it to indicate an email address:
Please email me at xyz@abc.com.
Use it to indicate an activity:
Everyone laughed at his singing.
She is good at making a sketch.
In: Use it for unspecific times during a day, month, season, and year:
She always goes for walk in the morning.
In the summer, we have a rainy season for three weeks.
The new session will start in April.
Use it to indicate a location or place:
I am currently living in my uncle’s home.
My hometown is New York, which is in USA.
Use it to indicate a shape, color, or size:
This drawing is mostly in red.
The students stood in a straight line.
This shirt comes in three different sizes.
Use it to express while doing something: An advertisement needs to be impressive in marketing a product.
Use it to indicate a belief, opinion, interest, or feeling: 
I believe in religion.

I am interested in playing chess.
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