While this is an area where one can spend years on, in general, indicative is used when there is certainty. The subjuncitve is used with emotion or doubt.
For example. Indicative. Yo voy al cine. I am going to the movies.
Subjunctive. Yo quiero que el vaya al cine. I want him to go to the movies. It is not something that is certain, it is a desire of one person for another. There are many rules regarding the use of subjunctive, it takes time (I am mediocre with it, at best).
Psychman
_________________ I said hey baby, take a walk on the wild side.
Lou Reed
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