I will be speaking at AltiumLive 2022. The conference is online and it is free, so if you are designing boards don’t forget to registers. You may find there some interesting presentations.
Altium has a lot of free templates for different form factors. For example, if you need to design a PCIE card, you don’t have to create it from scratch. You can download it and it will save you a lot of time. Here is the link to the Altium design content website: http://designcontent.live.altium.com/