Usually, a URL is something like domain..com, and a custom domain name is www.domain.com, This actually makes sense, as is free, and you need less technical skills to get started. From a learner perspective, it’s a zero investment, and return is high, if you plan to stick to platform it is a good idea to get a custom domain name for your blog. This will help you in many ways, which I will explain below:

1. Domain names are cheap
Buying a domain name is pretty cheap, you can easily get good domain name ending with .com or .org in between $10-$13. You can buy .com domain name for cheap from DomainKing.

2. Seriousness towards blogging
You have been working a lot on your blogs, but without a nice layout, template and domain name, people will not feel that you are very serious about blogging. One simple reason you are not ready to spend few dollars for the thing which you love.


3. SEO advantage:
Later on when you plan to migrate your blog to WordPress, custom domain name will ensure that you will not miss out link juice, and your migration will be more search engine friendly.

4.Branding
Using your custom domain name, you can use it to brand yourself easily. Use a nice logo, favico and banner to brand yourself. You can look for WordPress like themes to give an entire new look to your blogs.

5.Social media sites
being a free platform, is often targeted by spammers, and this is one reason they are less likely to be trusted by people on social media sites. When you use a custom name for your blog, this removes that first impression of a free blog. Do remember, Social media users doesn’t hate but they don’t even love it.


6.Web promotion
Talking about web promotion, which starts from social media sites to link building, most of the top websites doesn’t like giving a link back to domain. If you will notice WordPress Blogs blogroll, it will be hard to find a domain there.

http://www.standontech.com/2015/12/why-you-should-use-custom-domain-name.html

nice