What not to do when naming the app

Hello. We will be releasing an application soon. One free app is already on sale in the store. However, the next application to be released is planned to be released as a series. I know there are restrictions on the name of the app store. It doesn't remind me of drugs, or it can't be duplicated... I would like to release a paid application by attaching NO.1 and NO.2 to the name of the application. Each application is planned to be updated and repaired, and only functions and designs are different. The reason for having different NO. is design and function Because there is a difference. It's a light topic, so I'd appreciate it if you could share what you know, even if you're not sure.