Always make your portfolio unique to yourself and your style, every game dev has their own style of games they prefer to work on. Whether it be indie, action, MMO-RPG etc whichever you're most passionate about is what you should focus on.
How many quality games should be put on there?
Always remember quality over quantity. I've seen people hired with two incredibly good games over people with eight crappy games. I'd suggest having a medium of 3 games that show off your skill set, how you work, and most importantly your creative mind. Remember in game development you can make your imagination go wild, especially with Unity and Unreal frameworks your possibility is endless.
I'd always have a variety on your resume, having a lot dedicated towards the field you wish to go in is very important to an employer, however showing that you're able to work with other libraries, APIs and such is also essential. I'd say have something that is unique that can be used in multiple areas of development (Software, games, web etc). Remember the first thing that most employers look at in a developer application is what you've done and what you can do, having extra extra open source content that isn't specifically tied to one area will always be a bonus.
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How do I go about building a good portfolio?
Always make your portfolio unique to yourself and your style, every game dev has their own style of games they prefer to work on. Whether it be indie, action, MMO-RPG etc whichever you're most passionate about is what you should focus on.
How many quality games should be put on there?
Always remember quality over quantity. I've seen people hired with two incredibly good games over people with eight crappy games. I'd suggest having a medium of 3 games that show off your skill set, how you work, and most importantly your creative mind. Remember in game development you can make your imagination go wild, especially with Unity and Unreal frameworks your possibility is endless.
I'd always have a variety on your resume, having a lot dedicated towards the field you wish to go in is very important to an employer, however showing that you're able to work with other libraries, APIs and such is also essential. I'd say have something that is unique that can be used in multiple areas of development (Software, games, web etc). Remember the first thing that most employers look at in a developer application is what you've done and what you can do, having extra extra open source content that isn't specifically tied to one area will always be a bonus.