W3C Validator Errors

I entered my index.html code into the W3C validator and got a bunch of errors that Nick did not get:

Info: The Content-Type was text/html. Using the HTML parser.

Info: Using the schema for HTML with SVG 1.1, MathML 3.0, RDFa 1.1, and ITS 2.0 support.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/css/normalize.css for attribute href on element link: Illegal character in path segment: space is not allowed. From line 6, column 3; to line 6, column 98 /title>↩ <link rel="stylesheet" href="/Users/thania/Desktop/Web Development Exercises/css/normalize.css">↩ <li Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value http://fonts.googleapis.com/css?family=Changa+One|Open+Sans:400italic,700italic,400,700,800 for attribute href on element link: Illegal character in query: | is not allowed. From line 7, column 3; to line 7, column 140 e.css">↩ <link href='http://fonts.googleapis.com/css?family=Changa+One|Open+Sans:400italic,700italic,400,700,800' rel='stylesheet' type='text/css'>↩ <li Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/css/main.css for attribute href on element link: Illegal character in path segment: space is not allowed. From line 8, column 3; to line 8, column 93 t/css'>↩ <link rel="stylesheet" href="/Users/thania/Desktop/Web Development Exercises/css/main.css">↩ <li Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/css/responsive.css for attribute href on element link: Illegal character in path segment: space is not allowed. From line 9, column 3; to line 9, column 99 n.css">↩ <link rel="stylesheet" href="/Users/thania/Desktop/Web Development Exercises/css/responsive.css">↩ <me Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/numbers-01.jpg for attribute href on element a: Illegal character in path segment: space is not allowed. From line 30, column 11; to line 30, column 87 <a href="/Users/thania/Desktop/Web Development Exercises/img/numbers-01.jpg">↩
Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/numbers-01.jpg for attribute src on element img: Illegal character in path segment: space is not allowed. From line 31, column 15; to line 31, column 99 <img src="/Users/thania/Desktop/Web Development Exercises/img/numbers-01.jpg" alt="">↩
Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/numbers-02.jpg for attribute href on element a: Illegal character in path segment: space is not allowed. From line 36, column 11; to line 36, column 87 <a href="/Users/thania/Desktop/Web Development Exercises/img/numbers-02.jpg">↩
Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/numbers-02.jpg for attribute src on element img: Illegal character in path segment: space is not allowed. From line 37, column 15; to line 37, column 99 <img src="/Users/thania/Desktop/Web Development Exercises/img/numbers-02.jpg" alt="">↩
Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/numbers-06.jpg for attribute href on element a: Illegal character in path segment: space is not allowed. From line 42, column 11; to line 42, column 87 <a href="/Users/thania/Desktop/Web Development Exercises/img/numbers-06.jpg">↩
Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/numbers-06.jpg for attribute src on element img: Illegal character in path segment: space is not allowed. From line 43, column 15; to line 43, column 99 <img src="/Users/thania/Desktop/Web Development Exercises/img/numbers-06.jpg" alt="">↩
Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/numbers-09.jpg for attribute href on element a: Illegal character in path segment: space is not allowed. From line 48, column 11; to line 48, column 87 <a href="/Users/thania/Desktop/Web Development Exercises/img/numbers-09.jpg">↩
Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/numbers-09.jpg for attribute src on element img: Illegal character in path segment: space is not allowed. From line 49, column 15; to line 49, column 99 <img src="/Users/thania/Desktop/Web Development Exercises/img/numbers-09.jpg" alt="">↩
Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/numbers-12.jpg for attribute href on element a: Illegal character in path segment: space is not allowed. From line 54, column 11; to line 54, column 87 <a href="/Users/thania/Desktop/Web Development Exercises/img/numbers-12.jpg">↩
Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/numbers-12.jpg for attribute src on element img: Illegal character in path segment: space is not allowed. From line 55, column 15; to line 55, column 99 <img src="/Users/thania/Desktop/Web Development Exercises/img/numbers-12.jpg" alt="">↩
Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20. Warning: Section lacks heading. Consider using h2-h6 elements to add identifying headings to all sections. From line 27, column 5; to line 27, column 13 per">↩ <section>↩

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/twitter-wrap.png for attribute src on element img: Illegal character in path segment: space is not allowed. From line 62, column 51; to line 62, column 169 abrahams"><img src="/Users/thania/Desktop/Web Development Exercises/img/twitter-wrap.png" alt="Twitter logo" class="social-icon"></a>↩ Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Error: Bad value /Users/thania/Desktop/Web Development Exercises/img/facebook-wrap.png for attribute src on element img: Illegal character in path segment: space is not allowed. From line 63, column 46; to line 63, column 166 tye_1509"><img src="/Users/thania/Desktop/Web Development Exercises/img/facebook-wrap.png" alt="Facebook logo" class="social-icon"></a>↩ Syntax of URL: Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.

Do I need to be worried about any of these? Also, how do I correct the spaces? Or correct when the font stylesheet itsel came with "|"?