Demonologist's best equipment drastically helps players during the initial experience grind. Some items not included are the Candle and the Photo Camera. They are both needed for side objectives in certain maps, but they won't help you stay alive or identify the ghost. Like Phasmophobia, the single player is often more difficult than Multiplayer because your time is limited, especially on medium and hard difficulties.
https://screenrant.com/demonologist-best-equipment-buy-early/