Guarda el tarro de miel en la nevera, por favor.

Guarda is the informal singular command form of guardar.

Here, guardar means something like:

• put away
• store
• keep

So Guarda el tarro de miel en la nevera means Put the jar of honey in the fridge or Store the jar of honey in the fridge.

This is the form you use when speaking to one person you address as tú.

Because this is a command, not a normal statement.

• guardas = you keep / you store
• guarda = keep! / store! / put away!

Compare:

• Guardas el tarro de miel en la nevera. = You keep the jar of honey in the fridge.
• Guarda el tarro de miel en la nevera. = Put the jar of honey in the fridge.

So the sentence is giving an instruction, which is why it uses the command form.

It is understood, not said.

Spanish often leaves out subject pronouns when they are clear from the verb form.
In guarda, the verb already tells you this is a command to tú.

So the full idea is:

• (Tú) guarda el tarro de miel en la nevera.

But saying tú is usually unnecessary unless you want emphasis.

Spanish usually uses an article where English sometimes does not.

• el tarro = the jar

In this sentence, el suggests a specific jar of honey, probably one both speakers know about.

If you said:

• Guarda un tarro de miel en la nevera

that would mean Put a jar of honey in the fridge, which sounds less specific.

Yes, here tarro means jar.

A tarro is a container, often glass, used for things like honey, jam, or preserves.

In Spain, you might also hear:

• bote
• frasco

Depending on the context, all can refer to similar containers, but tarro de miel is perfectly natural.

Because de is commonly used in Spanish to show what something contains or what type of thing it is.

• un tarro de miel = a jar of honey
• una taza de café = a cup of coffee
• una botella de agua = a bottle of water

Using con miel would mean with honey, which suggests honey as an added ingredient rather than the main content/type.

So:

• tarro de miel = a jar containing honey / a honey jar
• tarro con miel = a jar with honey in it

The first one is the normal choice here.

En la nevera means in the fridge.

• en = in / inside
• la nevera = the fridge

So it tells you where to put or store the jar.

Even though English sometimes thinks of motion as into, Spanish often uses en with verbs like this to express the final location:

• Guarda eso en la caja. = Put that in the box.
• Pon la leche en la nevera. = Put the milk in the fridge.

So en is the normal preposition here.

Yes, nevera is a very common word in Spain for fridge.

Other possibilities include:

• el frigorífico = more formal/common in some contexts
• el refrigerador = more common in many parts of Latin America than in Spain

So for Spain Spanish, nevera sounds very natural.

Also, nouns in Spanish have grammatical gender, so it is:

• la nevera

You just need to learn nevera as a feminine noun.

Por favor means please, and in Spanish it is very flexible in position.

All of these are possible:

• Por favor, guarda el tarro de miel en la nevera.
• Guarda, por favor, el tarro de miel en la nevera.
• Guarda el tarro de miel en la nevera, por favor.

Putting it at the end is very common and natural. It softens the command and makes it polite.

Grammatically, it is a command form, but with por favor it often works as a polite request.

So depending on tone, it can feel like:

• Put the jar of honey in the fridge.
• Please put the jar of honey in the fridge.

In everyday conversation, Spanish often uses the command form for polite requests, especially with por favor and a friendly tone.

Yes, it is natural.

That said, in everyday speech, many speakers might also say:

• Pon el tarro de miel en la nevera, por favor.

Why? Because poner often sounds more directly like put when you are talking about moving something somewhere.

So both are fine, but they give slightly different shades:

• guarda = store / put away / keep
• pon = put / place

With a jar of honey going into the fridge, both are perfectly understandable and natural.

If you are speaking formally to one person (usted), use:

• Guarde el tarro de miel en la nevera, por favor.

Other versions:

• Guarda... = informal singular (tú)
• Guarde... = formal singular (usted)
• Guardad... = informal plural in Spain (vosotros)
• Guarden... = formal plural or Latin American plural (ustedes)

So the original sentence is specifically addressed to one person informally.

You can, but it is not usually necessary.

• Guarda el tarro de miel en la nevera. = normal
• Tú guarda el tarro de miel en la nevera. = possible, but more emphatic

Adding tú may sound like you are contrasting that person with someone else, or insisting:

• Tú guarda el tarro; yo guardo lo demás.

In neutral everyday speech, Spanish usually leaves it out.

Yes. Guardar is a very useful verb with several related meanings, such as:

• to keep
• to store
• to put away
• to save
• to preserve

Examples:

• Guarda este documento. = Keep this document.
• Guardo dinero para las vacaciones. = I save money for the holidays.
• Guarda silencio. = Keep quiet.

In your sentence, it clearly means put/store the jar in the fridge.