How to use since and for

For = Length and duration of time. 

• for  seven days.
• for ages.
• for a week.
• for a long time.
• for five years.
•  for several years.

I have lived here for ten years.
They have been  in New York for  five years.
I have known him for a long times.

Since = Point of time

• Since Sunday 
• Since the last month.
• Since the day I enrolled here.
• Since we felt in love.
• Since noon.
• Since the beginning.
• Since my birthday

I have learned English for two years.

I have learned English since 2013.

Note: for can use all tenses and since can use only perfect tenses
I stayed with my sister for three years.
Reena will come here for half an hour.