When we use "then" and "than" ?

As you know,  i  I  have many problems in with basic things in English , so  i  I  wanna want to know which what is the difference between then an and than.
thnx Thanks

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As Bonita said in the comments, the word 'than' is used when comparing things.

"Jane is taller than Eric."  (Bonita's example.)

"I like movies more than books."

"English is easier to learn than Arabic."

The word 'then' has two meanings, both related to time.  First, it can mean "after that".

"We went to dinner and then to a movie."

"I will study first, then do some exercise, and then go out."

Second, the word 'then' can mean "at that time".

"We studied English at school, but I did not like English then."

"I woke up at 5:00 a.m.  I felt tired then, but now I feel okay."