First of all, 'Always' means 'All the times/ Every time (Without Any Exception)', and 'Often' means 'Many times/ Frequently (BUT Not Every Time/ All The Times)'. For example,
If you say, "I always go to cinema on Sunday", it means you go to cinema on every Sunday.
And if you say, "I often go to cinema on Sunday", it means you go to cinema frequently on Sunday (BUT Not every time).
Did it help you to understand the difference between 'Always' and 'Often' ?