Meaning trap
deal with
handle a problem
to take action to solve a problem or manage a difficult situation.

Don't mix these meanings
Same phrase, different job.
to take action to solve a problem or manage a difficult situation.
Another meaning of 'deal with' is 'be about a topic'; compare the examples to keep the meanings separate.
Hear it in context
Notice where the phrase sounds natural.
She had to deal with a lot of stress at her new job.
In my opinion, learning how to deal with difficult people is an important life skill.
Fix the pattern
One small grammar move makes it sound right.
Not: Don't worry, I'll deal it.
Say: Don't worry, I'll deal with it.
Always 'deal WITH' + object — never drop 'with' (bare 'deal' means hand out cards).
Which sounds natural?
Tap the one a native speaker would say.
'Deal with' is the everyday verb for handling problems. 'Address a problematic situation' is report-speak, not conversation.
Build natural chunks
Words that usually travel with it.
deal with + challenge
- a problem
- stress
- customers
- the situation
Don't confuse it
Related
Other meanings and phrases to compare.
- deal with (be about a topic) — Another meaning of 'deal with' is 'be about a topic'; compare the examples to keep the meanings separate.