Item tag 1.14.2?

In Minecraft I want to introduce a currency that contains certain tags. I want to add certain tags to a diamond, but I do not know how. I've already looked at certain Youtube videos, but they are all outdated and no longer work in 1.14.2 …

I can offer you this website: https://www.gamergeeks.nz/apps/minecraft/give-command-generator

according to the author, version 1.14+ is also supported:-)

Thank you very much!