Spelling in the phrase "best practises" is incorrect

[Smot]

Sorry to be a pedant, but the word "practise" is a verb, so "best practises" is spelt/spelled incorrectly.

To remember the rule, think of the words "advice" and "advise" - the "c" is used for the noun, "s" for the verb:
"I advise" but "I give advice". So, similarly, "I practise" but "my practice routine". The same rule applies to "licence" and "license".

Ultra-pedant note: if the documentation is of Northern US origin, the word "practice" is used as both verb and noun. For one online example see http://www.grammar-monster.com/easily_confused/practice_practise.htm