Learn Hardcore Japanese: wakaranai tokoro ha sukuriinsyotto wo totte, ato de minaosimasu. - I take screenshots of the parts I do not understand and review them later.

Breakdown of wakaranai tokoro wa sukuriinshotto o totte, ato de minaoshimasu.

Why is there no particle between 分からない and ところ?

Because 分からない is modifying ところ directly.

This is a very common Japanese structure: a verb or adjective-like expression comes before a noun and describes it.

There is no word like that or which needed here, and no particle goes between them.

Other similar examples:

So 分からないところ is just a noun phrase meaning the part I don’t understand.

What does ところ mean here? Does it literally mean place?

Not literally, at least not in the physical sense.

ところ often does mean place, but it also has a wider meaning: part, point, aspect, or bit of something.

In this sentence:

For example, if you are reading a textbook, watching a video, or studying notes, ところ refers to the unclear section, not a physical location.

This use is extremely common in Japanese.

Why is は used after ところ?