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Use Obsidian Bases, native to Obsidian 1.8+, by writing a .base YAML file that defines filters, properties, and views over your vault notes. Place it in a folder like _meta/ and open it directly or embed it in a note with ![[_meta/name.base]].

Prefer Bases for standard filtered tables, cards, and grouping since it is native and GUI-driven with no plugin required. Choose Dataview when you need GROUP BY aggregations, computed columns, or complex cross-folder SQL-like queries.

Bases filters must be expression strings wrapped under and:, or:, or not: keys, not typed objects like {type: folder}. A bare list or typed object triggers the 'may only have one of and/or/not keys' parse error.

After a GROUP BY clause, individual file properties must be prefixed with rows., such as rows.file.link or rows.summary. Using bare property names after grouping returns empty columns or errors.

Use a Dataview query computing (date(today) - file.mtime).days and filter for values over 30, or a Bases formula like floor((now() - note.updated) / 86400000). Prefer file.mtime over frontmatter dates to avoid mixed-format arithmetic errors.