Learn Hardcore Dutch: Sinds vorige maand werk ik drie dagen per week thuis. - Since last month I have been working from home three days a week.

Dutch follows a “verb second” (V2) word order. When you start a sentence with an element other than the subject (here Sinds vorige maand), the finite verb moves to the second position, pushing the subject after it:
“Sinds vorige maand” (1) – “werk” (2) – “ik” (3) – rest.

What does sinds vorige maand mean, and can I replace vorige with something else?

Sinds vorige maand means “since last month.”
• You can replace vorige (“previous”) with other time markers:

sinds maart (“since March”)
sinds vorige week (“since last week”)
• You cannot omit sinds if you want to express “since.”

Can I say Ik werk sinds vorige maand drie dagen per week thuis instead?

Yes. If you keep the subject first, you revert to normal SVO order (Subject–Verb–Object/adverbials):
Ik (1) – werk (2) – sinds vorige maand (3) – drie dagen per week (4) – thuis (5).
It’s correct, but starting with the time expression emphasizes when you began.

What does drie dagen per week literally mean, and why per?

Drie dagen per week literally means “three days per week.”
• per here is a preposition used to indicate frequency (“each,” “every”).
• It’s the standard way in Dutch to talk about how often something happens in a given time unit.

Could I say drie dagen in de week instead of drie dagen per week?

You could, but it’s less idiomatic.
• drie dagen per week is the common form.
• drie dagen in de week is understandable but sounds a bit awkward in everyday speech.

Why is thuis at the end? Can I move it elsewhere?

Adverbs of place (like thuis) usually go after time and manner expressions in Dutch. The most neutral order is:
Subject – Verb – Time – Manner – Place.
Here: ik – werk – drie dagen per week – thuis.
You could also say Ik werk thuis drie dagen per week to slightly emphasize thuis, but the original feels most natural.

Is there a difference between thuis and vanuit huis?

Yes.
• thuis simply means “at home.”
• vanuit huis (literally “from home”) often stresses the fact that you’re working remotely instead of going into an office.
Both are correct, but werk ik thuis is shorter and more common in casual speech.

Why not werk ik drie dagen per week bij thuis or op thuis?

Because thuis as an adverb of place doesn’t need a preposition. You don’t say bij thuis or op thuis. Just thuis covers “at home.”

If I want to add met de computer, where would I put it?

It’s a manner expression, so it goes before place:
“Sinds vorige maand werk ik drie dagen per week met de computer thuis.”
Or more naturally:
“Sinds vorige maand werk ik drie dagen per week thuis met de computer.”