Here is the list of Helpful Free Udemy Courses
Oracle courses
Oracle Sql Developer Tips and Tricks
Oracle SQL – From Beginner to Pro
Oracle Database 12c SQL Fundamentals
Beginning Oracle WebLogic for Administrators
Quick Start Guide to Oracle SOA 12c
Advanced Databases and SQL Querying
Linux Courses
Learn Basic Commands in Linux Shell
Red Hat Enterprise Linux Technical Overview
Cloud courses
Cloud Computing With Amazon Web Services
Amazon Web Services – Learning and Implementing AWS Solution
BigData
Big Data and Hadoop Essentials
Setup Big Data Development Environment
Here is the list of Best selling Udemy Course to enhance your knowledge
Oracle SQL – Step by Step SQL
Oracle PL/SQL Fundamentals vol. I & II
Oracle E-Business Suite R12 Applications DBA
Oracle 11g Certified Professional Exam Prep I
Practice with Oracle RMAN
Learn Linux in 5 Days and Level Up Your Career
Complete Linux Bootcamp for Beginners
Udemy Courses are good But I would recommend checking on below things before spending money in it
1.Check the Preview the course for free (usually you are given 5 minutes, which is plenty of time to determine if that instructor’s teaching style and knowledge is up to par for you)
2.Check the Preview individual lectures for free. (most courses have certain lectures designated as “free preview lectures” by the instructor)
3.Check the course ratings.
4.Check the course feedback reviews.
5.Check the instructor’s biodata to see if they have the right qualifications to teach that course.
6.Check the course description and requirements for additional details about the course.