Hi @koovakk,
Your Portfolio landing page or main Collection is a jump off point to other project pages within your site.
To add images to Portfolio pages, you can upload them directly from Portfolio using the Image Module:
https://help.myportfolio.com/hc/en-us/articles/360035917814-Image-module
Or you may import from Lightroom with the Lightroom Module:
https://help.myportfolio.com/hc/en-us/articles/360035978374-Lightroom-module
Also see the PhotoGrid Module:
https://help.myportfolio.com/hc/en-us/articles/360035920114-Photo-Grid-module
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While Adobe Portfolio does not have its own community forum at this time, most PF users find help in LR, LR Classic or Creative Cloud Services. And there is a rather extensive FAQ & Knowledgebase as well as a dedicated Portfolio Support team to assist users with technical matters. See links below:
Hope that helps.