A full list of 5E languages, who speaks them and how to use them in your campaign.
D&D 5E languages explained: Every language in 5E
Delta's D&D Hotspot: Who Will Speak?
1ST LEVEL SPELL #20: Comprehend Languages (5E)
The complete DnD languages 5e guide 2023
Common, Forgotten Realms Wiki
The complete DnD languages 5e guide 2023
My Home Rule for Languages : r/DnDHomebrew
Language Trees for D&D / Fantasy Languages : r/worldbuilding
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Languages, Istria Wiki
D&D 5E languages explained: Every language in 5E