lagern
to store
To keep things, goods, or supplies in a place for a certain period of time.
Wir lagern die Winterreifen im Keller.
We store the winter tires in the basement.

to store / camp
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to store
To keep things, goods, or supplies in a place for a certain period of time.
Wir lagern die Winterreifen im Keller.
We store the winter tires in the basement.

The verb 'lagern' (to store/camp) is derived from the noun 'das Lager' (storage place/camp). This noun has two main meanings that are reflected in the verb: 'das Warenlager' (warehouse/storage facility, storing something) and 'das Zeltlager' (tent camp, camping).
Die Firma lagert ihre Produkte in einer großen Halle.
The company stores its products in a large hall.
When 'lagern' (to store) means to keep something in storage, it requires an accusative object. When it means 'campieren' (to camp), it is used without an object.
Wir müssen das Holz trocken lagern.
We need to store the wood in a dry place.
In connection with storing food or other products, you often read the instruction 'kühl und trocken lagern' (store in a cool, dry place).
Diese Medikamente muss man kühl und dunkel lagern.
These medications must be stored in a cool, dark place.
In the figurative meaning 'sich ansammeln' (to accumulate), 'lagern' is used reflexively with 'sich' and the preposition 'um' (+ accusative) or 'auf' (+ dative).
Die Schatten der Bäume lagerten sich auf dem Weg.
The shadows of the trees lay on the path.
The meaning related to geological deposits is typical of technical language, especially in geology and geography.
In der Tiefe lagern wertvolle Erze.
Valuable ores are deposited deep underground.
to preserve / protect
'bewahren' and 'lagern' can both mean that things remain in one place. The difference is the focus. 'bewahren' emphasizes that something is protected and does not get lost or damaged. 'lagern' is used more for goods, supplies, or materials that are stored somewhere for a certain period of time. Learners may confuse the words because both have to do with keeping or storing things. For personal or valuable things, 'bewahren' sounds more natural; for boxes, food, or goods in a room, 'lagern' fits better.

Wir lagern die Getränke für das Fest im Keller.
We store the drinks for the party in the basement.
Die Familie bewahrt die alten Fotos in einer kleinen Holzkiste auf.
The family keeps the old photos in a small wooden box.