I am rather confused about the comma rules in English. My colleagues (like me they're not native English speakers) tend to put commas after clauses like "In this window, you...", "As default, the number is calculated.....". I know that you're supposed to put a comma when there's a distinct pause - but is that the case here?
Thank you in advance.
Kag, I'd put the comma there too.
You can see the river through this window. No comma.
Through this window, you can see the river. Comma.
She could reach the cookie jar by standing on tip-toes.
By standing on tip-toes, she could reach the cookie jar.
Additionally, if the phrase is three or more words in length and introduces a clause, add a comma:
 In this window, you ...
If the phrase is less than three words in length and admits a pause in spoken English, add a comma:
 As default, the number is calculated ...
 First, we need to ...
Does that help?