DDG is fine. It’s hard to have a “completely private” search engine as currently only Big Tech has a comprehensive enough index of the internet to effectively provide a search engine.
Obsidian isn’t FOSS though. I’d recommend Notesnook as an alternative. I haven’t tried any of the following but I also know of Logseq (which aims to do what Obsidian does but FOSS), Joplin, and Standard Notes, which you might want to look into.
DDG is fine. It’s hard to have a “completely private” search engine as currently only Big Tech has a comprehensive enough index of the internet to effectively provide a search engine.
Obsidian isn’t FOSS though. I’d recommend Notesnook as an alternative. I haven’t tried any of the following but I also know of Logseq (which aims to do what Obsidian does but FOSS), Joplin, and Standard Notes, which you might want to look into.