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Probably would be good to have in your phone or tablet to carry along with you.
Even alone, one could use this for basic or immediately have simple a conversation and have your needs met.
Even as a study guide, eventually one will learn quite a bit.
Language is learned, but if not used, out it goes. You can find help by looking at Utube for speakers of a language and even tv shows in that language. Sub to a VPN service, and it might be easier to see tv in your language from that country.
Check forums for speakers of that language and ask them for places one could speak to others in particular language.
Simply to keep the basics fresh.