Normally, you use 'learn' when you are doing something new and learning the skill the first time. 'Study' is used for revising, re-learning those things. 'Study' is used more in America than England and also when talking about higher education (University)
Examples in use:
"I am learning how to fix a car" and "I will learn the alphabet at school tomorrow."
"I need to study for the exam tomorrow" and "I am studying Medicine at University"
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