I know there are no dumb questions when learning, but this might be a dumb one. Probably something I'd find the answer to later, but I'm dying to know now.

Is there no need to use "agus" in between two adjectives in Irish? Are there any exceptions, any situations you would use "agus" to separate adjectives?

And also, do you always use "agus" in between two nouns? Are there any exceptions?

I hope these questions aren't so general they can't be answered...

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I'm very much a beginner learner. Don't hesitate to correct me, as long as you explain why. This is how I learn best!

I am going to attempt this, but don't trust me.......!

Irish is the same as English in that you can say the big, red car / an carr mór dearg i.e. no and/agus. Again, I think as with English, you could say 'bhí sé beag agus fuar' - 'it was small and cold' so it depends on how the adjectives are being used.

For the last question, again I think Irish is the same as English. A list would not include 'agus' until the last one. Is maith liom oráistí, úlla, sútha talún agus plumaí. I like oranges, apples, strawberries and plums.

Wait for more knowledge and wisdom than I have to offer especially if you are planning to tattoo your love of fruit up your arm!!

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Things are changing, but traditionally:

1. with adjectives - no agus - ever.

2. with nouns - agus between every element in the list - mise agus tusa agus ruball na muice agus bacach Shile Andaí (notice that you start with "me" (a no-no in English) then "you", then "he/she/it" etc., i.e., literally "first person", "second person", "third person", etc.)

But under the influence of the feckin' feckin' ...

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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).

I concur with this. It would sound very odd to me to say something like "tá mé tinn agus tuirseach" or "tá mo chroíse briste agus brúite." (Can you tell I've been singing "Fear a' Bháta" all morning?)

Redwolf

So just to get this clear...
the sick old man (straight adjectives)
the man is sick and old (predicate, English has an 'and' here)
then these would have no 'agus', right?

Presumably you could say 'ach' though if you needed to say 'the man is young but sick'?

A couple of other usages

Though young the man is sick - Más óg is tinn an fear
A young but sick man - Fear óg ach fear tinn

So it's necessary to repeat the 'fear' before you put 'tinn'?

I don't think so.

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

I will be honest I don't know for sure if it's absolutely necessary but in the example given in de Bhaldraithe the noun is repeated.
p.92 - but. 1