Installing and testing.
I installed Oracle a few times and played with it. I didn't put a proper shutdown method in the shutdown scripts and there was also a mishap while testing the UPS. Both times I was unable to recover the Oracle database and had to reinstall. I had never had that much trouble with mysql. I installed it for someone else that had an Oracle expert and they where able to recover when we had a similar mishap there but all the googling in the world is nearly useless without a properly trained Oracle administrator. I'd suggest sticking with a database where the documentation is fully available and many many more people that can help you. There are easy free forums for mysql, maraiadb and postgresql.
Stellar rays prove fibbing never pays. Embezzlement is another matter.