Погрузка начинается сегодня на погрузочной площадке.

Погрузка is a noun meaning loading or the loading process. It names the activity itself, not the people doing it.

It comes from the verb family related to погрузить / погружать (to load). So in this sentence, the subject is not a person or company, but the process: Loading begins today...

Because the subject погрузка is singular. In Russian, the verb agrees with the subject in number and, in the past tense, also in gender. Here, since погрузка is one process or event, the verb is singular:

• погрузка начинается = loading begins

If the subject were plural, the verb would also be plural.

The verb here is начинаться, not начинать.

• начинать = to begin/start something
• начинаться = to begin/start (itself), to get underway

So:

• Компания начинает погрузку = The company starts the loading
• Погрузка начинается = The loading begins

In your sentence, loading is the thing that begins, so Russian uses начинается.

Russian often uses the present tense of an imperfective verb for something that is happening now or is scheduled/announced as beginning today.

So начинается сегодня can mean something like:

• begins today
• is starting today
• starts today

This is very natural in announcements, schedules, and official language.

Yes, absolutely.

• начинается сегодня sounds more like a process that is starting today, or a scheduled start
• начнётся сегодня focuses more on the single moment of beginning, using the perfective future

Both are possible, but they are not exactly identical in feel. In this sentence, начинается sounds quite natural for a neutral notice or announcement.

Russian uses different prepositions depending on how a place is understood.

Here площадка means something like site, area, yard, or platform, and Russian usually says на with that kind of open area or designated site:

• на площадке = at/on the site/area

Using в would sound wrong here because the loading is not happening inside an enclosed space. Russian normally treats площадка as a surface or area, not a container.

It is in the prepositional case singular because it follows на in the meaning of location:

• на площадке = at/on the site

Both the adjective and the noun must match:

• погрузочной = feminine singular prepositional
• площадке = feminine singular prepositional

The basic form is:

• погрузочная площадка

After на for location, it becomes:

• на погрузочной площадке

Yes. They come from the same root and are closely related in meaning.

• погрузка = loading
• погрузочный / погрузочная / погрузочное = loading as an adjective, as in loading area, loading equipment, etc.

So:

• погрузочная площадка literally means loading site/area/platform

This kind of noun-adjective relationship is very common in Russian.

It depends on context. Possible translations include:

• loading area
• loading site
• loading platform
• loading yard
• sometimes loading dock, if the situation fits

The most neutral choice is usually loading area or loading site. The exact English word depends on whether this is a warehouse, construction site, rail facility, shipping terminal, and so on.

Yes, Russian word order is flexible. This sentence has a natural, neutral order, but other orders are possible:

• Погрузка начинается сегодня на погрузочной площадке.
• Сегодня погрузка начинается на погрузочной площадке.
• На погрузочной площадке погрузка начинается сегодня.

These all mean roughly the same thing, but the emphasis changes.

The given version sounds like a straightforward statement: first the topic loading, then the fact that it begins today, then the place.

Russian has no articles like a or the. So погрузка can mean:

• loading
• the loading

and на погрузочной площадке can mean:

• at a loading area
• at the loading area

The exact meaning depends on context. Russian speakers understand definiteness from the situation, word order, and surrounding information rather than from articles.