How do guy build links if you have ever done it I tried making a blogging network but no one would answer.
Check out the Link Exchange and Link Sales threads in the "Other" section of Buy, Sell & Trade. You will need to be either an Established member or a Premium member to post there, but you can see who is offering link exchanges and perhaps PM those folks to get started.
There are lots of places where you can buy links. 1. Sales threads on the webmaster forums. 2. Facebook groups, there are plenty of groups where people sell links. 3. Manual outreach. 4. Fiverr and other similar websites. Please note, you will have to sieve through a lot of offers to find real gems.
You can try building crowd links at free platforms (directories, submitting your own blog, registering at different websites and placing profile links). But the best strategy to get natural links is, of course, outreach. Offer another webmaster to place the article with the link you need for money or for free offering cross-posting.
It's really not cost effective to build your own private blog network, unless you have like 10+ sites or plan on selling links to others. After the cost of buying decent authority domains, hosting, setting it up and content, you could do a month of PR and get far higher authority links without the hassle.
Place link of your site on other;s site either by link exchanging or by paying. You can PM me for more details. Regards