The “+” operator allows you to search for documents in which the word behind the symbol is necessarily present. It is allowed to use several “+” operators in one request. The “*” operator replaces any unknown word in the query.
If you put words or a phrase in quotation marks, then the search results will show only those pages on which these words (phrases) are located in the same order as in the query in quotation marks. Quotes are used when you need to find the exact word or phrase, quote.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.