Below are three simple ciphers for you to solve.

Message One
UJTUQJ FQQ FWTZSI YMJ BTWQI QNPJ YT XTQAJ UZEEQJX.

Hint One | Solution One

Message Two
MIGY JOTTFYM WUH VY BULX NI MIFPY, VON MIGY ULY YUMS.

Hint Two | Solution Two

Message Three
QVQ LBH GUVAX GUNG GUVF CHMMYR JNF UNEQ BE RNFL GB QB?

Hint Three | Solution Three