experience in sth
prep. phr..prep. phr.. the knowledge or skill you get from doing a particular job or activity for a long time.
prep. phr.. the accumulation of knowledge or skill resulting from direct participation in or exposure to a specific field or activity; typically used to quantify professional or practical background.
She has five years of experience in marketing.
The job description says they want someone with previous experience in customer service.
His extensive experience in international law made him the ideal candidate to lead the complex cross-border negotiations.
usually followed by a noun or a gerund (-ing form) to specify the field of expertise.
contrast with 'experience with' (often used for tools or specific people) and 'experience of' (often used for a single life event); 'in' is the standard for professional fields.
I have many experiences in teaching.I have much experience in teaching.when referring to professional skill, 'experience' is uncountable and should not be pluralized.