Hi , I am new to Semantic-UI & having difficulty to make the footer stick to bottom of page always.
Please help.

take a look at this http://philipwalton.github.io/solved-by-flexbox/demos/sticky-footer/ works for me like a charm.
Flexbox is the way to go.
Also, it is recommended that usage questions are posted on either ProjectTalk or stackoverflow. The Github Issues Tracker should only be used for bug reports and feature requests.
The feature of adding a native class of "footer" might be popular
We have 2020 now and still no native Semantic UI footer.
I'd love to see that in near future.
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The feature of adding a native class of "footer" might be popular