Does anyone know if this info is in the DMG, and if so, what page?

Edit* Nevermind. I found it. It's in the magic items chapter under spell scroll. LOL! Duh.

Here's a quality of life link to the Downtime Revisited on D&D Beyond, detailing the scribing of Spell Scrolls:

https://www.dndbeyond.com/compendium/rules/xgte/downtime-revisited#ScribingaSpellScroll

Why isn't this part about making an ability check to learn from a spell in the PHB? Pretty crucial information for a wizard to be blindsded by

Below, I have a link and description of where to find this info in the player's handbook. The only real difference is that the player's handbook it is more generic about the rules and doesn't mention the spell scroll specifically, just that if you happen to find a wizard spell you can copy it into your spellbook. As such, it also leaves out the part about the spell scroll being consumed by the process. I don't have my physical copy of the player's handbook, but I would assume that it's there as well. I don't like rules or abilities relegated to sidebars because they become very easy for people to pass over; people like myself.

Wizard Class

Section: Spellcasting

Subsection: Learning Spells of 1st Level and Higher

“Your Spellbook” sidebar

Oh I read that I was talking about how it fails to mention in there that you have to make an arcana check to copy a spell from a scroll into your book. 

Quote from Vexrapopple >>

Oh I read that I was talking about how it fails to mention in there that you have to make an arcana check to copy a spell from a scroll into your book. 

 Because that's not a property of the Spell Scroll, but part of the Spellcasting ability for Wizards. You wouldn't search for the Cleric's Divine Smite extra damage in the Weapons section of the Equipment chapter either, would you? :)

ok there seems to be a contradiction, the DMG in the section "Magic Items Categories" it says that

"Unless a scroll's description says otherwise, any creature that can understand a written language can read the script on a scroll and attempt to activate it."

But this page says

"A spell scroll bears the words of a single spell, written in a mystical cipher. If the spell is on your class’s spell list, you can read the scroll and cast its spell without providing any material components. Otherwise, the scroll is unintelligible."

So which is it? Seems to unnecessarily kneecap scrolls if only people who know the spell already can use them.

I have the same question also...

My understanding of it is that scrolls are essentially a way to bank or store magic, in such a way that a spell can be used some time in the future with out having to expend magical energy (spell Slot) or expensive / seasonal or hard to get components. As such the user of the scroll would still have to understand magic and be skilled  an particular domain, but all the work of preparing spell has already been done for them.

Essentially scrolls are a freebee spell slot but only for a particular spell. Now where spell scrolls get interesting is if player characters have the opportunity to be able to craft them themselves during there downtime using appropriate craft skills / tools / materials. A half dozen hours spent ornately drawing a ‘Prayer of Healing’ Scroll  when the player has time and materials to burn might just be the thing that saves the party’s skin a couple of sessions down the line. 

‘If you just want to give a non magic user access to a particular spell, knock up a wand or ring/magical item that has something like 1d4 +1 charges every 24 hours. Cantrip rings are a particular favorite of mine. 

general rule: scrolls can be used by anyone.

special rule: SPELL scrolls can only be used by people that have the spell on their class list.

there are other scrolls than spell scrolls. for example Scroll of Protection which can be used by anyone.

yeah but are there other non-spell scrolls than the scroll of protection. seems like a huge commitment of pages in the DMG for a niche circumstance

Quote from Vexrapopple >>

Why isn't this part about making an ability check to learn from a spell in the PHB? Pretty crucial information for a wizard to be blindsded by

 Yea, this just blindsided my Wizard, too.

The class just says "You might find other spells during your adventures. You could discover a spell recorded on a scroll in an evil wizard’s chest, for example, or in a dusty tome in an ancient library."

Then when I go to actually scribe a scroll in my spellbook I find out I am going to need Arcana for these. It feels kind of like a bait and switch.

What's the possibility of a cleric casting spells from other classes by using a scroll?

Quote from RegaLewis >>

What's the possibility of a cleric casting spells from other classes by using a scroll?

 Rules As Written: No possibility, unless that spell is also on the Cleric list.

So... The idea behind costs on copying spells is for the paper and ink needed to study it. Does that still apply when a wizard is learning a new spell from a spell scroll? Or is a scroll easier to learn from and you ignore the gold cost?

Quote from summussum >>

So... The idea behind costs on copying spells is for the paper and ink needed to study it. Does that still apply when a wizard is learning a new spell from a spell scroll? Or is a scroll easier to learn from and you ignore the gold cost?

 I would say no you wouldn't ignore gold cost unless your dm says it's fine because at the very least you still need ink to copy it into your spell book.

When a cleric casts a spell, which requires concentration - like bless, from a scroll, does the cleric still need to maintain the concentration for it, or has that been taken care of by the scroll.

Quote from the_Great_and_Wonderful_Tom >>

When a cleric casts a spell, which requires concentration - like bless, from a scroll, does the cleric still need to maintain the concentration for it, or has that been taken care of by the scroll.

 
Yes. The spell scroll lets the bearer cast the spell without providing any material components, but doesn't otherwise change how the spell works.

Since the bearer is the one casting the spell, concentrating on it is their responsibility as well. You can check the general magic item rules on DMG p.141 for the rest of the details, but it explicitly mentions this requirement.

scroll of 9th level fireball