MongoDB: Checking to see if an array field contains an unique value

1152120 pts.
Tags:
Big Data
MongoDB
I've been using MongoDB for over a month now and I have a blog post collection and each one has tags filled (which is an array). This is what it looks like:
blogpost1.tags = ['tag1', 'tag2', 'tag3', 'tag4', 'tag5']
blogpost2.tags = ['tag2', 'tag3']
blogpost3.tags = ['tag2', 'tag3', 'tag4', 'tag5']
blogpost4.tags = ['tag1', 'tag4', 'tag5']
Can I do search that contains tag1? Or even tag1 and tag2? Thank you.
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