Opportunities have become increasingly limited for those who lack college degrees, but there's one skill that can help a middle-skill worker move up in the workplace: Microsoft Excel.

According to a recent study, eight in ten middle-skill jobs (jobs that require a high school diploma, but not a college degree) require digital skills, which are crucial for the customer experience and operational ease of any modern company. Acquiring digital skills can also lead to a significant salary boost upwards of an additional $8 per hour--just for mastering essential office skills like Excel.

Learning Excel at the office through trial and error could take forever--or you could land that pay raise by taking "The Premium A to Z Microsoft Excel Bundle Ft. Alan Jarvis & Chris Dutton." The ten-course bundle is available at a discounted sale price of $39.99--a small price to pay for better opportunities and a better salary.

Excel is known for its simple spreadsheet function, but applying that data can create charts, graphs, tables and so much more. This beginner-friendly bundle teaches users everything from the basic functions of Excel to how to use its more advanced tools, such as creating PivotTables and PivotCharts in "Advanced Microsoft Excel Training".

Excel's data functions are about bringing data to life, and in the "Excel Pro Tips: Data Visualization" course, users learn how to master Excel's most powerful visualization tools. This course isn't for learning pie charts: it teaches users data visualization pro tips, like how to make interactive reports and dashboards that'll dazzle the next boardroom presentation.

Spreadsheets are necessary for organizing office data, which is why "Excel Pro Tips: Productivity Tools" should be in every office-goer's toolkit. The course teaches users keyboard shortcuts, autofill and flash fill, data validation and multi-level sorting, making those spreadsheet projects a lot less time-consuming.

For a more efficient worklife and improved leverage for a promotion, you might want to add Microsoft Excel to your resume. For $39.99, you'll know exactly how to input values and market your value as an employee.

Price subject to change.