Bam WordPress theme is a great flexible theme for blogging sites. Even this is a free theme you will find most of the advanced theme customizer options that you may find only on premium themes like, typography options, header layout options, advanced color options, blog layout options, social media options, etc.
Over the past few years we gathered information from support requests that we received from our theme users. And we discovered what kind of options that the most of the users are looking for. We used that data to develop this theme providing the best options you may find on a free theme.
Just install the theme and go to customize screen ( Dashboard > Appearance > Customize ) and customize it as you like.