Daily games are considered open book. You are allowed to use any dead material, including things like previously analyzed game, opening books, and other material. You are just not allowed to use a computer or table bases.
Live games, it would be considered cheating.
I've been thinking a good way for me to learn openings is to find one through one of my daily games, and then actively learn that opening and try to apply what I have learned to the game, ie a daily game comes up as the London System (new to me), so I go and watch videos/read up on the opening, and play a bot from the opening position to drive the concepts home. Then I would try and take learning back to my daily game and play forward from that opening.
To be clear, at no point am I directly lifting a move from any resource into my game, outside of something that I learned and applied from memory. Yes, it is possible that my opponent makes a move that is well-known against the opening, and I respond w/ a move that I learned as part of that opening. But, in my mind this is no different than how better chess players memorize openings and lines and then apply them.
Is this considered cheating? Of course, if you're using an engine to suggest moves to you, that would be cheating but that's not what I'm doing here. At the same time, I recognize that I am consulting outside resources in order to learn, although those resources are not telling me what to play in a direct sense. I want to be sure that this is both ethical and doesn't flag me for any problems if chess.com sees that I played a few practice positions against a bot.