Hi @Hinata !
HPE offers fixed-port (MSR9xx, MSR10xx), modular (MSR2xxx, 3xxxx, 4xxx) and modular provider-grade (HSR68xx) routers. They can cover pretty much of scenarios - from small office to campus or DC.
As a starting point I recommend you Hewlett Packard Enterprise Support Center - https://support.hpe.com/hpesc/public/home There you can find detailed specifications (QuickSpecs), Configuration Guides, Command Reference Guides and Configuration Examples for respective platform. All guides are separated by technology, for example "IP Services", "Fundamentals", "Layer 3 - IP Routing" etc etc.