Sei lidar com o problema.

In Portuguese, the subject pronoun is often omitted when the verb already makes the subject clear.

• Sei = I know
• So Sei lidar com o problema already clearly means I know how to deal with the problem

You can say Eu sei lidar com o problema, but eu is usually only added for emphasis, contrast, or clarity.

For example:

• Eu sei lidar com o problema, mas ele não. = I know how to deal with the problem, but he doesn’t.

Sei is the first-person singular present tense form of the verb saber.

Conjugation of saber in the present:

• eu sei = I know
• você/ele/ela sabe = you/he/she knows
• nós sabemos = we know
• vocês/eles/elas sabem = you/they know

So in this sentence, sei means I know or more naturally I know how to.

Portuguese has two common verbs that can translate as to know, but they are used differently:

• saber = to know a fact, know information, or know how to do something
• conhecer = to be familiar with, to know a person/place

Here, the sentence is about knowing how to do something, so Portuguese uses saber:

• Sei nadar. = I know how to swim.
• Sei lidar com isso. = I know how to deal with that.

You would not use conhecer here.

After saber, Portuguese often uses an infinitive to express knowing how to do something.

So the structure is:

• saber + infinitive

Examples:

• Sei cozinhar. = I know how to cook.
• Sei dirigir. = I know how to drive.
• Sei lidar com o problema. = I know how to deal with the problem.

So lidar stays in the infinitive because it is the action that the speaker knows how to do.

Lidar com is a fixed expression meaning:

• to deal with
• to handle
• to cope with

It is very commonly used in Brazilian Portuguese.

Examples:

• Ela sabe lidar com crianças. = She knows how to deal with children.
• Não sei lidar com pressão. = I don’t know how to handle pressure.

It is best to learn lidar com as a chunk, not just lidar by itself.

Because lidar normally takes the preposition com.

So in Portuguese, you deal with something using:

• lidar com algo
• lidar com alguém

Examples:

• lidar com problemas = to deal with problems
• lidar com pessoas difíceis = to deal with difficult people

This is just how the verb works. In English, many verbs also need specific prepositions, and this is one of those cases in Portuguese.

Portuguese uses definite articles much more often than English does.

So o problema literally means the problem, and this is very natural in Portuguese.

In many contexts, Portuguese prefers:

• com o problema instead of just
• com problema

Without the article, it may sound less natural or more general depending on context.

Yes, absolutely.

Both are correct:

• Sei lidar com o problema.
• Eu sei lidar com o problema.

The version without eu is more neutral and common in everyday speech.
The version with eu may sound more emphatic:

• Eu sei lidar com o problema. Confia em mim. = I know how to deal with the problem. Trust me.

It is grammatically in the present tense, but its meaning is often close to ability/skill.

So sei lidar com o problema can mean:

• I know how to deal with the problem
• I can handle the problem

It suggests learned ability, competence, or familiarity with handling that kind of situation.

A rough pronunciation guide is:

• sei ≈ say
• lidar ≈ lee-DAR
• com o often sounds connected, something like ko-mo
• problema ≈ pro-BLE-ma

A rough full version:

• say lee-DAR ko-mo pro-BLE-ma

A few notes:

• In natural speech, com o is often linked smoothly.
• The stress in problema is on ble: pro-BLE-ma.

Both can be translated naturally as I can handle the problem, but they are not exactly the same.

• Sei lidar com o problema = I know how to deal with the problem; I have the know-how or skill
• Consigo lidar com o problema = I’m able to deal with the problem; I can manage it

So:

• sei emphasizes knowledge, skill, or experience
• consigo emphasizes ability or possibility in the situation

Sometimes they overlap a lot, but the nuance is useful.

Lidar com is quite neutral and very common. It works in:

• everyday conversation
• professional settings
• writing

For example:

• Ela sabe lidar com clientes difíceis.
• Precisamos lidar com esse assunto logo.

So it is a very useful expression to learn for many situations.