for me it was very helpful to attend the face2face training for the VMCE and to take the exams for the last versions to become a VMCE. The deeper you get into it, the better you understand which settings are the best for the given circumstances.
Every customer we administrate is a special in its own way... you will only get the best out of it, if you deeply understand whats going on in VBR and what will be the best for the given circumstances (VMs, software, network, server, storage, RPO / RTO...).
I must admit... I adminsitrate about 50 different customers, all with their own circumstances, and theirfore I work a lot with Veeam's products every day, but there are still some things I still have to ask in the forums. Sometimes I still need the documentation.
Veeam works out of the box. Not like many other products. But when you have to backup a lot of data in a given backup window and we are no longer talking about "start backup in the evening... it finishes somewhere around midnight and your 5 VMs are safe".. you need deeper knowledge!
Welcome to the forum, read the documentation, ask your questions when the problems persist, or if you need more /deeper information