How often..
It's used to ask question about the frequency of an event.
Use how often and ever to ask questions about frequency
How often do you go to the cinema?
Before the main verb
Do you ever go to the cinema at the weekend?
adverb of frequency
Always
Almost always
Usually
Often
Normally
Sometimes
Hardly ever
Rarely
Seldom
Occasionally
Almost never
Never
Form Use
In front of the main verb
We often spend Christmas with friends
After the verb be
We are never late for work.
Use the adverbial a lot to mean often or frequently
We go to the cinema a lot
Use phrases with every as adverbials of frequency
Use every with words like minute, hour, day, week, month and year and days of the week and months of the year
There is a big celebration every year.
Use the phrase every other
On alternate
We will email you every other day.
use phrases with once, twice, three times, four times, etc. and a period of time
I go swimming twice a week.
use much/a lot with a negative to mean not often
We don't go out much/a lot