הארון ליד הדלת, והכיסא לידו.

In Hebrew, the verb to be is usually not stated in the present tense.

So:

• הארון ליד הדלת = The closet/cabinet is ליד הדלת
• והכיסא לידו = and the chair is לידו

This is very normal Hebrew.
In the past or future, Hebrew does use forms of היה:

• הארון היה ליד הדלת = The closet was next to the door
• הארון יהיה ליד הדלת = The closet will be next to the door

ה־ is the Hebrew definite article, meaning the.

So:

• ארון = a closet / a cabinet
• הארון = the closet / the cabinet
• דלת = a door
• הדלת = the door
• כיסא = a chair
• הכיסא = the chair

Unlike English, Hebrew attaches the directly to the beginning of the noun.

ליד means next to, beside, or by.

It is a preposition, so it introduces a location in relation to something else:

• ליד הדלת = next to the door
• ליד הבית = next to the house
• ליד השולחן = next to the table

So in הארון ליד הדלת, the phrase ליד הדלת tells you where the closet is.

In Hebrew, many prepositions can take pronominal suffixes. That means the pronoun gets attached directly to the preposition.

So:

• לידי = next to me
• לידך = next to you
• לידו = next to him / it
• לידה = next to her / it
• לידנו = next to us

So לידו is literally next-to-him/it as one word.

It refers to הארון.

Why? Because:

• ארון is masculine
• דלת is feminine

The suffix ־ו is masculine singular, so לידו means next to it/him, referring to the masculine noun הארון.

If the sentence meant next to the door, you would expect לידה, because דלת is feminine.

Hebrew often uses the same pronoun forms for he and it when the noun is masculine.

So לידו can mean:

• next to him for a masculine person
• next to it for a masculine thing

Since ארון is an object, the natural English translation here is next to it.

The nouns in this sentence are:

• ארון — masculine
• דלת — feminine
• כיסא — masculine

This matters because Hebrew pronouns and suffixes must match the gender of the noun they refer to.

That is why:

• לידו = next to it/him (masculine)
• לידה = next to it/her (feminine)

So the grammar helps you identify what the pronoun is pointing back to.

ו־ means and.

So:

• הכיסא = the chair
• והכיסא = and the chair

This is very common in Hebrew: the word for and is attached directly to the following word.

A simple pronunciation guide is:

ha-aron leyad ha-delet, ve-ha-kise leyado

A few notes:

• הארון = ha-aron
• ליד = leyad
• הדלת = ha-delet
• והכיסא = ve-ha-kise
• לידו = leyado

In natural speech, the stress is usually toward the end of these words.

This word order is the most natural and neutral way to say it:

• הארון ליד הדלת
• והכיסא לידו

Hebrew often likes a structure like:

noun + location phrase

So this sounds straightforward and natural:
The closet is next to the door, and the chair is next to it.

Other word orders are sometimes possible, but they may sound more marked, literary, or context-dependent. For a learner, this sentence is a very good basic model to follow.