If we use DynamoVisualProgramming.Core 2.8 version, our nodes will surely be compatible with Dynamo 2.8 version. What other Dynamo versions will they be compatible with? All newer up to Dynamo 3.0? Or will they also work with 2.0 - 2.7 versions? Where can we find this information?
They will work with older versions provided you do not use apis which were only added in 2.8. If you wish to be 100% sure to have full compatibility - target the earliest version possible.