10 Sites to learn Excel for free

1. Microsoft Excel Help Center    
2. Excel Exposure
3. Chandoo
4. Excel Central
5. Contextures
6. Excel Hero b.
7. Mr. Excel
8. Improve Your Excel
9. Excel Easy
10. Excel Jet

10 Sites for Free Online Education

1. Coursera
2. edX
3. Khan Academy
4. Udemy
5. iTunesU Free Courses
6. MIT OpenCourseWare
7. Stanford Online
8. Codecademy
9. Open Culture Online Courses
10. Alison

10 Sites to review your resume for free

1. Zety Resume Builder
2. Resumonk
3. Resume dot com
4. VisualCV
5. Cvmaker
6. ResumUP
7. Resume Genius
8. Resumebuilder
9. Resume Baking
10. Enhancy

10 Sites for Interview Preparation

1. Ambitionbox
2. AceThelnterview
3. Geeksforgeeks
4. Leetcode
5. Gainlo
6. Careercup
7. Codercareer
8. InterviewUp
9. InterviewBest
10. Indiabix

10 Tech Skills in demand

1. Machine Learning
2. Mobile Development
3. SEO/SEM Marketing
4. Data Visualization
5. Data Engineering
6. UI/UX Design
7. Cyber-security
8. Cloud Computing/AWS
9. Blockchain
10. Internet of thing (IOT)

Top 10 Sites for your career

1. Linkedin
2. Indeed
3. Naukri
4. Monster
5. JobBait
6. Careercloud
7. Dice
8. CareerBuilder
9. Jibberjobber
10. Glassdoor