Is it Beginner's level or Beginner level?

[Kwfine]

Hi teachers,

I am writing an email to my best friend, Jan, who lives in Australia.
These are some of the things that I am going to tell her in the email:
...
There will be no school for a few days on 18th this month due to federal holiday.
I am thinking of doing some self-paced learning at beginner's level, such as Japanese, painting, horse riding.
...

But I am not sure if I should say Beginner's level or Beginner level.
Compare: Intermediate level, Advanced level
Are there any other grammatical mistakes in my email, teachers?

Thank you.

Kitty.

[James]

At beginner level would be fine.

[Jim Jim]

A minor addition -
"...no school for a few days BEGINNING on THE 18th OF..."
You can't have a few days off during the one day, so it is a few days starting then.

[Gkukreti]

Well, Jim in above statement you said: "...no school for a few days BEGINNING on THE 18th OF..."

When to use and not to use "of" after date(is it applicable only with numericals?). Please explain it grammatically.

[Jim Jim]

As you know, when it's your native language, you don't always know the "why."

It's NOT the number, I would also say, "The first of the month..." and so on.
As I look at the sentence, the meaning is really, "The first DAY of the month..." but we leave out the word "day" and keep the rest of it.

Hope that helps