If you want to start exploring topics such as advanced routing, VLAN, OSPF, BGP, MPLS, IPsec,… here my book:
Index file in pdf format: https://www.zen.pn.it/images/book-routing-en.pdf
Paperback: https://www.amazon.com/Theory-laboratories-exercises-Mikrotik-RouterOS/dp/1686046960
Kindle: https://www.amazon.com/dp/B07X5MHR1Y
Regards.
v.