Could you introduce a section that lets you search through the Articles D&D beyond has posted. A lot of them are really good reference material for new players especially the 101 Beginner Guides series and the 201 Magic Items series. I found those extremely helpful when I was starting out and it would be great if they were more easily accessible and catalogued by year.

If I remember correctly there was a Articles link which you could use in the media type to search for all published articles on the site.

Along with the Beginner Guides there was also Spell spotlight and How to play specific monster articles which were great and that I would like to read again once in a while. I think most of those were written by James Haeck while he was part of DnD Beyond.

I may be incorrect, but it seems to me the old article browser was removed after DnD Beyond was bought by Wizards of the Coast and started to be used to communicate to fans instead of WotC's site dnd.wizards.com.

It is possible to browse through all DnDBeyond articles using this link but it has no search function and you would have to go through the results until you find what you are looking for.

It is also possible to find tagged articles, though the usage of tags is not consistent. A few good ones are:
https://www.dndbeyond.com/tag/spell-spotlights
https://www.dndbeyond.com/tag/player-tips
https://www.dndbeyond.com/tag/new-players-guide
https://www.dndbeyond.com/tag/running-monsters
https://www.dndbeyond.com/tag/how-to-play-monsters

Regarding the class guides, not everything is tagged so I'll link all the class 101 articles here.

General
https://www.dndbeyond.com/posts/1047-d-d-101-a-quick-breakdown-of-classes-in-dungeons
https://www.dndbeyond.com/posts/1065-d-d-101-choosing-a-race-for-your-dungeons-dragons
https://www.dndbeyond.com/posts/765-new-players-guide-selecting-your-first-spells

Artificer:
101 Class Guide - Artificer
101 Subclass Guide - Alchemist
101 Subclass Guide - Armorer
201 Multiclassing Guide - Artificer
201 Infusions Guide
201 Magic Items Guide - Artificer

Bard:
101 Class Guide - Bard
101 Subclass Guide - College of Lore
101 Subclass Guide - College of Valor
101 Subclass Guide - College of Eloquence
101 Subclass Guide - College of Creation
101 Subclass Guide - College of Spirits
201 Magic Items Guide - Bard

Barbarian:
101 Class Guide - Barbarian
101 Subclass Guide - Path of the Berserker
101 Subclass Guide - Path of the Totem Warrior
101 Subclass Guide - Path of the Battlerager
101 Subclass Guide - Path of the Beast
201 Magic Items Guide - Barbarian

Cleric:
101 Class Guide - Cleric
101 Subclass Guide - Life Domain
101 Subclass Guide - Knowledge Domain
101 Subclass Guide - Light Domain
101 Subclass Guide - Order Domain
201 Magic Items Guide - Cleric

Druid:
101 Class Guide - Druid
101 Wild Shape Guide
101 Subclass Guide - Circle of the Land
101 Subclass Guide - Circle of the Moon
101 Subclass Guide - Circle of Spores
101 Subclass Guide - Circle of Stars
101 Subclass Guide - Circle of Wildfire
101 Subclass Guide - Circle of the Shepherd
201 Multiclassing Guide - Druid
201 Magic Items Guide - Druid

Fighter:
101 Class Guide - Fighter
101 Subclass Guide - Champion
101 Subclass Guide - Battle Master
101 Subclass Guide - Eldritch Knight
101 Subclass Guide - Echo Knight
101 Subclass Guide - Gunslinger
201 Magic Items Guide - Fighter

Monk:
101 Class Guide - Monk
101 Subclass Guide - Way of the Open Hand
101 Subclass Guide - Way of the Four Elements
101 Subclass Guide - Way of Shadows
101 Subclass Guide - Way of the Ascendant Dragon
101 Subclass Guide - Way of the Cobalt Soul
201 Magic Items Guide - Monk

Paladin:
101 Class Guide - Paladin
101 Subclass Guide - Oath of Devotion
101 Subclass Guide - Oath of the Ancients
101 Subclass Guide - Oath of Vengeance
101 Subclass Guide - Oath of the Open Sea
201 Magic Items Guide - Paladin

Ranger:
101 Class Guide - Ranger
101 Subclass Guide - Hunter
101 Subclass Guide - Beast Master
101 Subclass Guide - Gloom Stalker
101 Subclass Guide - Drakewarden
101 Subclass Guide - Fey Wanderer
201 Magic Items Guide - Ranger

Rogue:
101 Class Guide - Rogue
101 Subclass Guide - Thief
101 Subclass Guide - Assassin
101 Subclass Guide - Arcane Trickster
201 Magic Items Guide - Rogue

Sorcerer:
101 Class Guide - Sorcerer
101 Subclass Guide - Draconic Bloodline
101 Subclass Guide - Wild Magic
101 Subclass Guide - Storm Sorcery
101 Subclass Guide - Aberrant Mind
101 Subclass Guide - Clockwork Soul
101 Subclass Guide - Lunar Sorcery
201 Magic Items Guide - Sorcerer

Warlock:
101 Class Guide - Warlock
101 Subclass Guide - The Fiend
101 Subclass Guide - The Archfey
101 Subclass Guide - The Great Old One
101 Subclass Guide - Undead Patron
101 Subclass Guide - Fathomless Patron
201 Spells Guide - Warlock
201 Magic Items Guide - Warlock

Wizard:
101 Class Guide - Wizard
101 Subclass Guide - School of Evocation
101 Subclass Guide - School of Abjuration
101 Subclass Guide - School of Conjuration
101 Subclass Guide - Order of Scribes
101 Subclass Guide - Bladesinger
201 Magic Items Guide - Wizard

Blood Hunter:
101 Class Guide - Blood Hunter