Hello!! or more like 點呀？

I am currently living in HK for a semster abroad and purchased the glossika Cantonese mass sentence thing. Anyway in some sentences I have noticed they say 喺度 for example:

Barbara 係度睇緊報紙 -   Barbara is reading a newspaper

我係度做緊嘢. 我唔係睇緊電視 - I'm working. I'm not watching TV.

個電話係度響 - The phone is ringing

So you use it when something is happening at that exact moment, but then sometimes you don't have to use it? Like in:

我哋食緊晚飯 - We're having dinner.

佢哋喺 公  園 度玩緊 - They're playing in the park.

Little confused as to how 喺度 is used and when. Because my dictionary is translating it as meaning here but I am confused.

Any help would be much appreciated.

Hey I am just starting to learn Cantonese and just want to confirm some phrases that I translated from google translate, as I know it can be dodgy sometimes I just want to check to see if they are correct in jyutping

syut3 sat6 waa2 - to tell the truth

jyu4 gu2 ngo5 syun3 co3 di1 waa2 - if I'm not mistaken

na6 mo5 - Anyway

man6 dak1 hou2 - that is a good question

Any help would be much appreciated thanks!

Lew