Serialization problems (lots of problems)

I write once again on the forum about the same problem because I didn't get satisfactory answers.
For my project I'm building a little personal engine in Unity to automate some processes that instead would be expensive.
Therefore, I'm working on various interfaces among which: Custom Inspectors, Editor Windows etc...
The point is this: Through these multiple windows and inspectors, I find myself generating and managing lots of variables, lists of variables, classes, lists of classes, arrays, lists of arrays and similars.
I tried everything in these last months: Serialization, json library, xml, playerPrefs, streamWriter, streamReader. Nothing seems to work. I keep obtaining untranslatable errors or the obtained result is not the hoped one.
Nobody seems to be able to help me and the forum's guide is not at all clear. So I start from the beginning and I open this thread, hoping to get answers and patience:
Considering the variables' type and objects above mentioned that I have to keep between edit mode, play mode and after closing and reopening the program as well: What do You suggest? How can I overcome this mangy obstacle? Thank you very much.

 

You can't serialize objects that are not ISerializable or do not implement this interface. So that for starters I hope you know IE classes that inherit from Monobehavior. If you have Dictionaries, this will be a hard thing to serialize in XML. I found this helpful hopefully this helps you. I suggest JSON however as the files tent to be smaller than XML because of formatting etc. Newtonsoft has an awesome JSON DLL that you can use in your project to serialize pretty much anything to JSON including Dictionaries.

Now you are very vague as to what it is that is wrong or what it is you need...saving date to a file for persistence is always great not sure why that wouldnt work for you. If anything you can always create .assets whill serialize and save your data in Edit and play mode. You can load it from Resources folder Resources.Load("MyAsset") as MyAssetClass;. Again, its very vague so please be specific as to whats the problem.

 

I have just posted semi-related but re ScriptableObjects. . So far I've found them the best way forward but my post was about how best to implement them. . Even with ScriptableObjects you cannot easily serialise dictionaries. If you're interested in scriptableobject Google that and inventories and you'll quickly get a feel for their massive potential...

 

It's funny because after posting this desperate question I found the solution ^^"
I found an interesting, useful and very clear thread where serialization and following problems are well explained.
I leave below the link to the thread for the users like me that will have troubles:
http://blogs.unity3d.com/2012/10/25/unity-serialization/

Thanks to Polymorphik and Duffer123 for the answers