Just some simple questions.

I know several words/phrases that mean "because":

toisc/toisc go
mar gheall ar
mar
de bhrí go
i dtaobh

I know some of these have the more subtle meaning of "due to" or "on account of", rather than just
a pure "because" as a conjunction (or maybe that's wrong). Could anybody tell me anything about when
you should use or the other?

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

toisc without go, mar gheall ar and i dtaobh can't be used before verbs, they are prepositions. "I dtaobh" + noun means "concerning". The others mean "because OF".

But "i dtaobh (is) go" means "because" and can be used before a verb.
Anyway, most conjunctions that mean "because" end with the conjunction "go" (except "mar", "óir", "nó").

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

mar gheall ar go is used before verbs in Connemara.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

Yeah, if you add "go", otherwise it doesn't work

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

GRMA!

Is there any difference between toisc, mar gheall ar and i dtaobh before nouns:

Let's say:
Éirím as an ól mar gheall air.
Éirím as an ól ina thaobh.

I know that toisc tends to be "because" when what follows is a verbal noun type phrase.
toisc iad a bheith tagaithe
(Is that right?)

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

I can't tell you, I don't use these prepositions

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne