Link exchange is nothing else except it is just placing the other person's blog link on your page at suitable place and other 
person will also do same in support of you.

my blog post: <a href="https://elqsar9.wordpress.com/%d8%b4%d8%b1%d9%83%d8%a9-%d9%83%d8%b4%d9%81-%d8%aa%d8%b3%d8%b1%d8%a8%d8%a7%d8%aa-%d8%a7%d9%84%d9%85%d9%8a%d8%a7%d9%87/" rel="nofollow">كشف تسربات ماء</a>