Will PC disc games automatically download on steam?

I play all my games on console, but I am soon making a full changeover to PC. I am not new to computers, but I am kind of new to Steam and overall PC gaming. Due to me not finding the "better" editions of the games I want on the Steam store, I decided to pre-order all the games for disc. But before I do this, I want to know one thing:
If I put the disc into the PC, will it automatically download onto steam, or will it just play off the disc? What exactly happens?
Please don't question me about why I wouldn't just get digital games etc. I will only get the digital copies of already released games and/or games without extra content in them (Season Pass) etc. Please tell me if there is actually a way to buy the "better" editions of the game (digital) with steam keys etc.
Thanks in advance!
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How do I install a Steam game from disc?
How do I automatically download Steam games?
How to update Steam gamesDo PC games still come on disk?
Retail PC games do still exist \u2013 they account for around 2% of the PC market according to the GI.biz report \u2013 but for the most part they're still suffering from that 'CD key in a box' problem.How do you download a game from a disc?
Insert your game disc into your computer's disc drive. Click Install on the game installation pop-up window. Follow any prompts to install your game.How to FIX Slow Download Speeds Steam Games (Fast Method!)
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