One may not say , I can't tell you about so & so , implying that there is what do say.
Don't say , too many praises about someone , which may lead someone to say , but.
Now may be a good time for a gem of Torah study.
www.GemsofTorah.com
Gems of Torah by Rabbi Moshe Goldberger. We can use these essential "Gems" interspersed throughout our day to add vital meaning and inspiration.