font change for twenty twelve

There are many ways you can do this, here are two:

Easy method:
Find the font you want here: https://www.google.com/fonts
Download this plugin: https://www.ads-software.com/plugins/wp-google-fonts/
Target the header and tagline in the Custom CSS section.

More advanced method:
First, you’ll want to make a child theme so your changes do not disappear when you update your theme, see this page: https://codex.www.ads-software.com/Child_Themes

Next, you’ll want to find the web font you want, I recommend Google fonts: https://www.google.com/fonts and they’re free

Then, you’ll want to enqueue the script in your functions.php file and set the fonts in your child themes style.css file

Thanks Travis. I thought I was just getting my feet wet but I guess I’m in up to my neck. Yes this works-I need to play with it now…

Some of what I have here might also be related:

/* Header */
.site-header {
	padding: 24px 0;
	padding: 1.714285714rem 0;
	position: relative; /* our add */
}
.site-header h1,
.site-header h2 {
	text-align: center;
}
.site-header h1 a,
.site-header h2 a {
	color: #515151; /* very dark gray */
	display: inline-block;
	text-decoration: none;
}
.site-header h1 a:hover,
.site-header h2 a:hover {
	color: #21759b; /* WordPress dark blue */
}
.site-header h1 {
	font-size: 24px;
	font-size: 1.714285714rem;
	line-height: 1.285714286;
	margin-bottom: 14px;
	margin-bottom: 1rem;
}
.site-header h2 {
	font-weight: normal;
	font-size: 13px;
	font-size: 0.928571429rem;
	line-height: 1.846153846;
	color: #757575; /* dark gray */
}
.header-image {
	margin-top: 0; /* our mod */
	margin-top: 0rem; /* our mod */
	vertical-align: bottom; /* our add */
}