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―Git (go to GitHub and sign up, practice for free)
―Software Management Practices (Agile, Kanban, XP)
―Package Managers (NPM/Yarn in JS land, NuGet in .NET, maven in Java)
―UI/UX (To fast track this, learn a couple component frameworks like Bootstrap or Material Design and you can start seeing the fundamentals in the commonalities)
―Project Management Tools (Jira, Trello, monday, etc.)