Hi @Dominika Kuraś-Moskwa _Deviniti_ ,
Every group is best in one or the other way. It all depends on what you need from Community!!
I joined product groups and local groups. All groups are listed in https://community.atlassian.com/t5/Groups/ct-p/groups
If you are looking to answer different user queries, then go to https://community.atlassian.com/ and select the products. You will start seeing the posts/questions/articles next time when you open https://community.atlassian.com/
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With your project team members
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It all depends on your interests. The Atlassian Community has everything within its own universe. So you just choose!!
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