Is curse real?
yes.
Is blessing real?
yes
Bible says our tongue has the power to bless and curse, many people in the Bible blessed and God did accordingly, and people cursed and God did accordingly too.
we are not however to curse others.
Romans 12:14
Bless those who persecute you; bless and do not curse.

James 3:9
With it we bless our God and Father, and with it we curse men, who have been made in the similitude of God.

James 3:10 NKJV

Out of the same mouth proceed blessing and cursing. My brethren, these things ought not to be so.

Psalm 109:17 NKJV

As he loved cursing, so let it come to him; As he did not delight in blessing, so let it be far from him.
Break the Curse and be Blessed.

– Credit : youtube.com/genoark