Since Ignition stores everything in traditional databases instead of proprietary archives, you can limit the need for english by setting up a simple Ignition test system, running it two hours at a time, and looking into the database to see what you get.
Yes. I'm already studying the manual. But I do not see the specification for data input/output.
What do you mean? Do you use direct recording via queries? Without your API?
Your web University is amazing 
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Install Ignition. Create a few memory tags. Write a timer script that'll fake some changing data in those tags. Turn on history for those tags. Look in the database to see what was recorded. Ignition doesn't use its own proprietary history archive. Everything is inserted into your database via JDBC. The API is to hide the complexity of shared-column data storage from the user. IA doesn't guarantee that the data storage architecture (DB schema) won't change in the future, so using the API is highly recommended, but the storage methodology has been pretty stable.