verb
1
BAD : I've applied a one-year course in computer studies.
GOOD : I've applied for a one-year course in computer studies.
BAD : I don't have enough experience to apply to the job.
GOOD : I don't have enough experience to apply for the job.
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apply ( to an organization) for a job, course, scholarship, etc.: 'She has applied for the post of Senior Lecturer.'
2
BAD : The new tax law applies only on people with large incomes.
GOOD : The new tax law applies only to people with large incomes.
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apply to sb/sth (= be aimed at): 'The club's rules and regulations apply to all members.'