Here is a list of top courses that you can do after 12th and they can provide you quality jobs after their completion.
• Digital Marketing Courses
• Computer Courses
• Interior Designing Courses
• Fashion Designing Courses
• Video Editing Courses
• Graphic Design Courses
• Teaching Courses
• Foreign Language Courses
• Makeup and Hairstyling Courses
• Yoga Instruction
• Content Writing Course
• Cooking Courses
• Photography and Videography Courses
• Child Psychology Courses
• Jewellery Designing Courses
• Dance Courses
• Entrepreneurship Courses
• Art and Craft Courses
There are various websites like coursera, great learning google garage that provide some of these courses for free.