I know that we have already many questions answering for "How to become an MVP" etc. But I see that it is not really clear what should NOT be added in the nomination forms.

Could you please share with me your experience and add here everything that in your opinion will NOT help people in the MVP nominations process?

Simply, what you did for the community not for your clients or your company.

Shortly put; "What you've done for the Sitecore Community".

Officially

This year, it was divided into 4 sections.

Motivation

What motivates you in your community work. And "I want to become MVP" is not going to impress anyone ;-)

Objectives (for next year)

What are your plans for community work next year. Regardless of MVP status.

Online Activities (this year)

A list of everything you've done, that we can track online. Open Source contributions, blogs, tweets, whatever it may be.

Offline Activities (this year)

And a list of what you've been up to, that isn't easily tracked online. User Group presentations, other offline activities.

And a few notes and considerations

The work you do in everyday life, working for your boss/employer - none of that needs to be part of your application. You don't get MVP for doing your job. It's fine you did a client workshop on SXA because a client asked for one; it's also fine that you built and delivered an Experience Awards winning site for another client. It's just not related to MVP status :-)

And scrambling onto every social media channel mid October when MVP season starts (but nothing going on for the entire year before October)... Good start - keep it up for the next round of nominations ;-)

Aside from what was already answered by Mark and Tamás, I see a lot of confusion in people thinking MVP status is about being experienced with Sitecore like "Developer A has been working with Sitecore for 8 years so he deserves an MVP status because he is a great developer and does great work". Again if Developer A is not active in community, social channels, slack, community forums, essentially does not contribute to the community in any way they are not eligible.

Remember it's related to how much the community benefit from what you have been doing(not your clients or company).

Something else to add here is that it will depend on the type of MVP you are going for:

Technology MVP

All of the above. Doesn't matter how long you have been working with Sitecore or what your skill level is, a Technology MVP is all about contributing to the community.

Digital Strategist MVP

Again this is about contributions, but sometimes with a strategy role, the work you do cannot be shared with the community due to NDA with clients etc... So with this type of MVP, you can detail in the nomination what you have done to help clients realize their digital strategy using Sitecore - but community involvement is still important if you can

Commerce MVP

Similar to Technology MVP but with a slant toward Commerce and also those that are using Sitecore Experience Commerce to deliver client solutions. Although, I would guess that those 2 things go together anyway :)

Ambassador MVP

This is less about community contributions and more about people who help provide Sitecore with feedback on the product and participate in panels setup by Sitecore for this purpose. They should still participate in community events, but will probably be doing more behind the scenes work to help Sitecore than other MVP types.

tl/dr;

Community, Community, Community - and the important thing to note here is that it is contributing to the community, not just watching community. Being on Slack or SSE isn't a contribution - actively participating, answering/asking questions, presenting, writing your own blog posts - that is the key and what should go on the form. Adding that you watched a video on Sitecore on YouTube! probably not!