Ensure you understand which Edition you need and that you are aware of any restrictions for the platform you intend to install on.
cat /etc/oracle-release
cat /etc/redhat-release
cat /etc/os-release
lsb_release -id
uname -r
Install latest version of ORAchk then run...
orachk -profile preinstall
unset ORA_NLS10
unset TNS_ADMIN
unset ORA_CRS_HOME
unset EXTSHM
export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOSTNAME=$(hostname)
As 'oracle'...
touch /home/oracle/.Xauthority
xauth add localhost.localdomain/unix:0 MIT-MAGIC-COOKIE-1 99999999999999999
Copy magic cookie from output of xauth list as 'root'
cd /u01/app/oracle/product/19.0.0/dbhome_1
unzip -q /u01/img/*db_home.zip
(Skip this step if you do not wish to integrate TSM with RMAN for database backups)
Follow these links to create a new database instance...
Follow these links to upgrade an existing instance to a later version...