Create your own combined tools with custom settings through Fusion Macros. You can export macros to the template library and to the Resolve Edit Effects Library.
Building your own Fusion tools and templates from existing nodes is simple. Once you have built a composition and adjusted all parameters you can export any number of connected nodes into a Fusion macro.
You can use macros afterward exactly the same way you use any other Fusion tool. You can combine them with further tools, add inputs and masks, and change or animate their parameters.
To locate the macro folder, try to save a new macro. You can see the Resolve folder in the Save dialogue that opens.
Each macro is saved as a *.settings file. You can download and add extra macros into the macro folder or you can move macros over to the Fusion template folder. The advantage of the template folder is that you can organize it with more folders and you can search it from the templates section in Fusion.
Do you want to have an effect in the Effects Library of the Edit page? You can copy the macro into the titles folder of the Edit effects templates. This is suitable for all effects that do not rely on any input. Like title effects, lower thirds, etc.
In some cases, creating a Macro is not necessary and may not be convenient. To reuse Fusion effects from the edit page directly, you can make media clips from Fusion effects and share them through power bins: Control and Reuse Fusion Elements from DaVinci Resolve Edit Page