Correction:

Today I had a day off, so I spent the time relaxing. I read a famous Japanese mystery book which was very exciting, I enjoyed reading it a lot. Time flies quickly when you're having fun! I also studied English a little bit and learned the new words "influence" and "effect", however I could not understand the difference between them.

Answer:

The words "influence" and "effect" are synonyms (mean the same thing) and can generally be used interchangeably. However, the word "effect" can also be used when talking about "special effects", for example when CGI is used in films.

The effect is usually the result of something. 

We have a phrase called "Cause and Effect".

Example: 

-The storm caused a dramatic effect on the town's people.

-the lethal effects of hard drugs

Influence is the power to affect, control or manipulate something or someone ...like when something is altering your behavior. 

For example, Your friend tells you to go to the store and buy some candy. You go to the store and buy the candy. Your friend "influenced" you to do that.

Example: 

-His favorite singer influenced him to create beautiful music as well.

-the influence of television violence.

-social forces influencing criminal behavior

etc.

Resource = https://www.researchgate.net/post/What_is_the_difference_betweem_influence_and_effect_in_researches