The best gift which parents can give to their children is good education.
١ مايو ٢٠٢٢
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The best gift which (that) parents can give to their children is a good education.
I think you could use “which” or “that” here in British English, but only “that” in American English.
https://www.lexico.com/grammar/that-or-which
Personally I think “that” sounds more natural here.