Is NoSql different than MySql. And should I learn it instead

Answer 1

yes it is different. SQL is relational database where noSql is non relational database.
it is good to learn both, some applications are suited with using SQL (ex: applications where data integrity is essential) and some others are suited with using noSql (ex: simple applications or applications where speed is essential)

Answer 2

yes both are different. NoSqL is not only sql and MySQL is RDBMS database software where you can execute sql.