learnxinyminutes.com/ is a good site to quickly view syntax for a new language if you are already familiar with programming concepts
as you mentioned, problem solving is a good way to force yourself to get used to syntax, documentation, idioms, etc
apart from online coding sites, translating your own projects from another language could be a nice option as well
personally, it has helped immensely to convert my tutorials from one language to another - often, when I learn a new concept/trick in the new language, I go back and see how it could be done in the other language and that helps a lot
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learnxinyminutes.com/ is a good site to quickly view syntax for a new language if you are already familiar with programming concepts
as you mentioned, problem solving is a good way to force yourself to get used to syntax, documentation, idioms, etc
apart from online coding sites, translating your own projects from another language could be a nice option as well
personally, it has helped immensely to convert my tutorials from one language to another - often, when I learn a new concept/trick in the new language, I go back and see how it could be done in the other language and that helps a lot