I have OSx 10.9 How can I update and to what?

From 10.9 no matter what you will need to get to 10.11 before you can install any macOS past that point.

Without more info about your exact Mac—hard to say anything definitive beyond that.

OS X 10.11 El Capitan - Technical Specifications:

https://support.apple.com/kb/SP728

How to upgrade to OS X El Capitan - Apple Support

https://support.apple.com/en-us/HT206886

download direct:

http://updates-http.cdn-apple.com/2019/cert/061-41424-20191024-218af9ec-cf50-4516-9011-228c78eda3d2/InstallMacOSX.dmg

MacBook (Early 2015)

MacBook (Late 2008 Aluminum, or Early 2009 or newer)

MacBook Pro (Mid/Late 2007 or newer)

MacBook Air (Late 2008 or newer)

Mac mini (Early 2009 or newer)

iMac (Mid 2007 or newer)

Mac Pro (Early 2008 or newer)

Xserve (Early 2009)

Back up your data, check your applications for compatibility, and depending on which MacBook model you have, download El Capitan, High Sierra, or Catalina.

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