Adverbs of frequency tell us how often something is done.

Adverbs of frequency include; always, constantly, continually, frequently, infrequently, intermittently, normally, occasionally, often, periodically, rarely, regularly, seldom, sometimes etc.

For example:

I always do my homework on time. - In this sentence always shows us the frequency (how often) I do my homework on time.
She goes out occasionally. - In this sentence occasionally shows us the frequency (how often) she goes out.

Most frequent always
constantly
nearly always
almost always
usually
generally
normally
regularly
often
frequently
sometimes
periodically
occasionally
now and then
once in a while
rarely
seldom
infrequently
hardly ever
scarcely ever
almost never
Least frequent never

Adverbs of frequency appear between the subject and the verb in a sentence:-

For example:

I always update the calendar at the beginning of the month.
Poetria often takes notes during the Skype sessions.

Adverbs of frequency appear after a form of the to be - am, are, is (was, were) in a sentence:-

For example:

I am never late.
Skype is occasionally frustrating.
They were always noisy.

Adverbs of frequency go between an auxiliary verb and the main verb:-

For example:

Anne doesn't usually smoke.

If there are two auxiliary verbs, the adverb of frequency goes between them:-

For example:

I have never been to Asia.

The adverbs of frequency often, usually, sometimes and occasionally can go at the beginning of a sentence:-

For example:

Usually I don't give personal advice. = I don't usually give personal advice.
Occasionally we go for a drive on a Sunday. = We occasionally go for a drive on a Sunday.

Adverbs of frequency go before the verbs used to or have to:-

For example:

I always used to celebrate bonfire night.
I usually have to get up early to walk Laika.

When something happens regularly at a fixed time we can use the following as adverbs:-

Every day
=
Daily
Every week = Weekly
Ever fortnight (two weeks) = Fortnightly
Every month = Monthly
Every year = Yearly/Annually

For example:

I get a newspaper every day. = I get the newspaper daily.
I pay my rent every month. = I pay my rent monthly.