6h) In how many projects can I be involved simultaneously as main or co-applicant?

You should try to focus on one fully-fledged project. If you have a completely different research idea, you can submit a second project proposal or participate in another project. Back-to-back projects with briefly overlapping funding periods are generally not a problem.

The SNSF does not differentiate between main applicants and co-applicants. All applicants enjoy equal rights, share project responsibility and make a significant contribution to the project..