How do Brazilians use tipo?

Brazilians use tipo as a filler, to introduce an example, and before numbers, the same three ways English speakers use "like".

PortugueseMeaningIn CiaoSpeak
tipo…like…Unit 33
Tipo assim…Like, you know… (casual)Unit 33
Tinha tipo umas vinte pessoas.There were like twenty people.Not in the course
Eu queria algo tipo uma pizza.I wanted something like a pizza.Not in the course

What does que tipo de mean?

Que tipo de…? means "what kind of…?": here tipo is the normal word for "type" or "kind", fine in any register. Rodrigo, the ride-app driver in CiaoSpeak's Speak tab, asks you this one:

PortugueseMeaningIn CiaoSpeak
o tipokind, typeUnit 28
Você gosta de que tipo de música?What kind of music do you like?Unit 28
De que tipo de música você gosta?What kind of music do you like?Speak: Ride-app car
esse tipo de coisathat kind of thingUnit 33
todo tipo deall kinds ofUnit 33

Is tipo slang?

As a filler, yes: tipo meaning "like" is casual, and, as with "like" in English, using it in every sentence sounds very young. In a job interview or formal writing, leave it out. As "type, kind", it's standard Portuguese.

Who you're talking toCan you say it?
Friends, people your ageYes
Work, casuallyA little is fine
Job interviews, formal writingLeave the filler out

How can you practice Brazilian Portuguese out loud?

Practice it in short, real exchanges, out loud. CiaoSpeak's Brazilian Portuguese course teaches everyday words like tipo… and né? with a recording in a Brazilian accent, and in the Speak tab people across Brazil (a São Paulo baker, a Rio ride-app driver, your language-exchange partner Ana) ask you one question at a time. You answer by voice or typing, and the app tells you whether a Brazilian would understand you. Lessons are free; in the Speak tab, today's questions (up to five a day) are free too, and CiaoSpeak+ adds practice in any scene whenever you like. More words like this one: the Brazilian slang list.