كل ما تشتغل بالطين اكتر، كل ما تتعلم اكتر.

This is a very common pattern meaning the more ..., the more ....

So:

• كل ما تشتغل بالطين اكتر = the more you work with clay
• كل ما تتعلم اكتر = the more you learn

Even though كل often means every or all, in this structure كل ما ... كل ما ... works as a set expression, not word-for-word every what.

Because Arabic is matching two linked ideas:

• first part: one thing increases
• second part: another thing increases too

So the repeated كل ما creates the correlative structure:

• كل ما X اكتر، كل ما Y اكتر
• the more X, the more Y

In English, we also repeat the pattern: the more ..., the more ...

تشتغل comes from the verb اشتغل and in Egyptian Arabic it commonly means:

• to work
• to be working
• sometimes to function / operate, depending on context

Here it means to work in the sense of doing hands-on work with clay.

So تشتغل بالطين means something like:

• you work with clay
• you do clay work
• you practice using clay

Because the verb here normally takes the preposition بـ when you mean work with a material or medium.

So:

• بالطين = with clay

This بـ often means:

• with
• in
• using

So تشتغل بالطين is very natural for work with clay.

It is made of:

• بـ = with / in / using
• الطين = the clay

Together:

• بالطين = with the clay / with clay

In English we usually just say with clay, even though Arabic has the definite article ال.

اكتر means more.

It appears twice because both halves of the sentence are comparative:

• تشتغل ... اكتر = work more
• تتعلم اكتر = learn more

In Egyptian Arabic, اكتر is extremely common for more / more than / to a greater extent.

That is a very good question, because learners often expect the b- prefix in Egyptian present-tense verbs.

In Egyptian Arabic, بـ often marks the habitual/present:

• بتشتغل = you work / you are working
• بتتعلم = you learn / you are learning

But after expressions like كل ما, speakers very often use the bare imperfect without بـ. In this kind of general relationship or repeated-condition pattern, dropping بـ is normal and natural.

So:

• كل ما تشتغل ... كل ما تتعلم ... sounds natural
• it expresses a general rule: the more you work, the more you learn

As written, تشتغل and تتعلم are most naturally understood as masculine singular or sometimes a generic singular you.

So this sentence can be used to address one male person, or just you in a general sense.

If you were clearly talking to a woman, you would usually say:

• كل ما تشتغلي بالطين اكتر، كل ما تتعلمي اكتر.

If you were talking to a group:

• كل ما تشتغلوا بالطين اكتر، كل ما تتعلموا اكتر.

Because Arabic usually does not need an explicit subject pronoun when the verb already shows the subject.

So تشتغل already contains you work, and تتعلم already contains you learn.

Adding إنت is possible for emphasis, but it is not necessary:

• natural: كل ما تشتغل بالطين اكتر، كل ما تتعلم اكتر
• more emphatic: كل ما إنت تشتغل بالطين اكتر، كل ما تتعلم اكتر
  But this is less neutral and usually not needed.

It expresses a general truth or general principle.

It means something like:

• whenever you do more clay work, you learn more
• increased practice leads to increased learning

So it is not about one single event. It is more like advice, observation, or a rule of experience.

Not in natural English, but that question points to something important.

The structure كل ما can sometimes mean whenever / every time in other contexts, but here, because both halves end with اكتر, the meaning is clearly the comparative pattern:

• the more ..., the more ...

So in this sentence, that is the best understanding.

A simple learner-friendly pronunciation would be:

koll ma tishtaghal bit-ṭiin aktar, koll ma titʿallam aktar

A few notes:

• كل is usually pronounced koll
• تشتغل is often something like tishtaghal
• بالطين sounds like bit-ṭiin because the ل of ال assimilates to ط
• تتعلم is something like titʿallam
• اكتر is aktar

You do not need to pronounce it in a super formal way; a natural Egyptian rhythm matters more.

Yes, it sounds natural and idiomatic.

The pattern كل ما ... كل ما ... is very commonly used in Egyptian Arabic to express the more ..., the more ... relationships.

So this sentence is a good, useful model you can reuse with other verbs, for example:

• كل ما تقرا اكتر، كل ما تفهم اكتر.
  The more you read, the more you understand.

• كل ما تتمرن اكتر، كل ما تبقى احسن.
  The more you practice, the better you become.