Creating a save and load menu for presets

I want to create a save,load,save as and help section in my plug-in . I tried to create a dropdown menu to list my presets . But i couldn’t decide the correct method to save them or load them. ı tried to search but there are a lot of ways , some of this methods are deprecated or not recommended anymore. I need an up date info about current juce save&load preset features or an example to see how it is going to be done.
Can you please help me about this issue? For my load section i will use a dropdown menu to see my presets, maybe a rescan item will be needed. For “save” and "save as " i will use buttons but again i need to know what to do after that button is pressed . for help section again a dropdown menu or a popup menu will be needed. So really need your suggestions to start from correct point.