How do I port an old mod to a newer version of Minecraft?

[PulseBeat_02]

So there is this mod called Ambience, (a mod which adds music), that I would like to port to 1.15. The current version is 1.12. What steps would I take to get the code from the Github and set the version in Gradle/Forge to 1.15? I've downloaded the code in a zip file, edited the gradle config file to set the mcp mappings to the latest 1.15 version, and set the version to the latest 1.15 forge version. After that I ran gradlew eclipse and gradlew genEclipseRuns. Is there anything else I have to do before in order to get myself started and start changing up the code to make it compatible with forge 1.15? Thanks.

[PulseBeat_02]

Nevermind, I got it fixed by myself. No need for help!

[MCstrijder]

Hi, could you please share how you got it fixed?

It could totally be working completely different now, but I want tot port a 1.19.3 mod to 1.20.2

[Luis_ST]

You can checkout this page in the forge documentation.
https://docs.minecraftforge.net/en/1.19.x/legacy/porting/