Something like debug tool with list available fields and relations maybe? 🙂 Sorry for noob questions, i'm web-developer, but need to learn NetSuite for my new job

Take a look at the records browser https://www.netsuite.com/help/helpcenter/en_US/srbrowser/Browser2016_1/script/record/account.html

@Karina looks good thank you! But if i need search any not default field? Or custom added relation? In my current task i have Sales Order where may be exist relation. And i need know relation exists or not. If exist I need to display a message in PDF Template

you got to take some basic NS classes; understanding accounting helps, too

Now i learning netsuite courses at official MyLearn portal

You can get the chrome extension, advanced field help. If you click on any of the field, it will provide you the source for it, and you can directly go to that source list from it for most sources. It has other uses too like searching for the field on the record based on the internal I'd of the field among other things. You may also want to look into the following extensions that come very handy for a developer specifically. 1. search export 2. Scripted records 3. Field explorer 4. Html script notes There are a couple more but don't want to overwhelm you with info.