I am a new mod user and there are a few aesthetic mods that i'm trying to use, that are coming up as "doesn't have a manifest" I was reading that you have to actually replace certain files in the content folder of stardew valley, but i'm unsure as how to go about that. For example one of the mods changes the text of the bachelors and i don't know where I need to move the file to. Currently all of the mods are just chilling in the mods folder under stardew valley.
You're missing Pathoschild's "Content Patcher" which those content packs depend on. Install that, and then see if it errors again. Download: https://www.nexusmods.com/stardewvalley/mods/1915?tab=files