There is no. of things which are small but very important in
SEO:-
1.
Domain life: Domain life
is very important. A domain life should be more than 2 years. It puts a
positive impact on google, if you buy your domain for more than 2 years.
2.
Server Response time:
Your web server where your website is hosted should be uptime and well
maintained so your website could not be down for a while. IP address of a
server also affects your website e.g. if your website is hosted on a shared
hosting where many other website hosted, IP address of the all shared website would
be same. In shared hosting if any website will do any illegal thing google will
black list that IP address who is hosting that website and in this case your
website will also get affected (due to same IP address). So, if your website is
hosted on VPS or dedicated server then this kind of problem will not bother you.
3. SEO Friendly URL: A web site should have SEO friendly. URL should like www.example.com/mobile-app-development/ not like www.example.com/page=home?id=10 etc.