DevOps Tools on SAP Cloud Platform

Dear expert

If I want to use DevOps tools on SAP Cloud Platform, is there any recommended SAP tool?

Also, can I use the tool for free just by subscribing to Cloud Platform?

Now, I would like to implement a side-by-side extension, but if it is not possible to develop only with SAP Cloud Platform and I need to use DebOps tools from other copanies, I think that it's more effective to use another Cloud Platform(eg:Azure).

However, I'm not familiar with SAP Cloud Platform services in the first place.

Please tell me what I need to know when developing.

Best regards,

Daisuke