Use Google like a pro.

3. You can use the OR operator to get the results related to one of the search terms
(javascript OR python) free course
(javascript OR python) free course
5. You can use the (*) wildcards as placeholders, which will be replaced by any word or phrase.
"how to start * in 6 months"
"how to start * in 6 months"
7. You can also use a very useful feature that helps to find a specific file type.
filetype:pdf learn css
filetype:pdf learn css
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A few more tips.
9. Use the `before` operator to return only results before a given date
javascript before:2020
9. Use the `before` operator to return only results before a given date
javascript before:2020