If it is too long for you, some key points:

- free software

- support decentralized internet: „Users must not be pushed to register at a proprietary social networks resp. at particular providers of such services. Users without such account must not be disadvantaged – use open and decentralized networks/protocols instead.“

- do not mix software engineering with irrelevant political topics: „in order to contribute, it must not be required: to sign any political, religious or other proclamation or agree with it“

Rest of the Manifest is mostly related to quality and security issues.