If you're stuck

Learning english

Man: Reporter

Woman: Reporter

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Woman: And there are other ESL packages, lots of videos, tapes,
textbooks, readers, materials from the government.
Man: And let's not forget regular TV and radio. And if you can't
understand all of the programs, just use your VCR or tape
recorder to replay the segments until you do.
Woman: And there're also community resources, newspapers, newsletters,
tutors, things to do in the community.
Man: And don't forget family and friends who speak good English.
Get them to help you with your studies.
Woman: Just talk to them as much as you can.
Man: In English.
Woman: If you're stuck, ESL schools like this can also help you.
Man: So can libraries and community centers.
Woman: And you can always help yourself by looking up words
in dictionaries and by finding out more about life in ....

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What does "If you're stuck" mean?

Thank you