If you have enabled wildcard ssl certificate to secure sub domains then different sub domain will not create an issue.

For example,

First Case :

If you will issue wildcard ssl certificate on *.xyz.com then it will secure :

contact.xyz.com
email.xyz.com
blog.xyz.com

Second Case :

If you will issue wildcard ssl certificate on *.get.xyz.com then it will secure :

contact.get.xyz.com
email.get.xyz.com
blog.get.xyz.com

If any website is using SHA-1 certificate

@gaobo I have tested one site https://www.cncbinternational.com which are in Chinese language and using ev ssl certificate and that website name is displaying in English only. You can also take help of online support team of ssl provider to make your doubt clear if you have.

If you want to see your website/organization name in green bar then you should go with EV SSL certificate. I have checked your website and it is currently giving me an error of ssl security in both google chrome and Firefox. If you go to enable ev ssl on your website then it will give you other benefits like listed here https://www.clickssl.net/blog/ev-ssl-certificate-helps-to-increase-revenue-and-profits including showing your business/domain/website name in the green bar.

Recently, I have read about Samsung has stopped the production of 'Samsung Galaxy Note 7' at http://www.bbc.com/news/business-37618618

@lslqtz Google chrome browser giving error and blocking SHA-1 certificate as per https://security.googleblog.com/2015/12/an-update-on-sha-1-certificates-in.html

I think AstroGrep software will do it for you because its "context" feature will look at source code too. If you are unable to search for some format file like .php, .txt then you should read this http://www.howtogeek.com/99406/how-to-search-for-text-inside-of-any-file-using-windows-search/

For nail shop, you simply require desktop/laptop to manage each entry of service/product provide to the customer in excel sheet.

Depend on website requirement for securing web pages, the type of ssl certificate will be decided. To read information on ssl types read https://www.clickssl.net/blog/all-ssl-certificates-are-not-equal I don't think there is any kind of restriction for ssl certificate but ssl will become must to enable for websites (which accept confidential information) as per google announcement at https://security.googleblog.com/2016/09/moving-towards-more-secure-web.html

Yes, off course using. I like it to remain updated with latest news in place of find news from news based website.

If there is a free ssl certificate then some limitations like limited time period (such as 90 days), secures only one domain etc comes with it.

Day by day people grow with their business and also prefer online identity for their business such as website, blog etc. Many of them have no knowledge about programming and how website works and all. So for these people programmers and their services will become helpful to build website and questions to resolve regarding it.

That's why service providers often publish their articles based on programming services by putting emphasis on programmers like on which platform they work for you, which kind of services they will provide etc.

@syhily I can't say it is expensive because saved some money at this https://www.clickssl.net/promotion/wildcard-ssl-coupons

If you are web developer and going to lunch your any app or software in the market for users then how will users trust your software or app that it is not compromised by third party? So for that you need to sign the software code through code signing certificate. If you are still confuse regarding how it works and what benefits it gives then read more at here https://www.clickssl.net/blog/code-signing-security-for-mobile-application-developer

@lslqtz Microsoft has also told users to stay away from SHA1 ssl certificate https://www.clickssl.net/blog/microsoft-is-set-to-retire-sha1-rc4

Checkout below listed resources to compress PNG images:

http://compresspng.com/
http://www.creativebloq.com/design/image-compression-tools-1132865
https://tinypng.com/
http://ezgif.com/optipng

No need to take different ssl certificate for above listed 4 domains because you can secure them with single wildcard ssl certificate and if talking about management of different ssl certificate, it will take lots of time, so wildcard ssl cert remains best which secures not only 4 sub domains but unlimited sub domains.

You can read about wildcard ssl certificate from here https://www.clickssl.net/blog/what-is-wildcard-ssl-certificate

If there is any certificate authority then it is obvious that it's price remains higher than any other ssl providers. Because it may happen that those ssl providers are re-seller of that ssl certificate authority. Symantec, Geotrust, Thawte, Comodo are known as trusted certificate authority. So if I will go to purchase any ev ssl certificate then I will not go to purchase it directly from the CA (certificate authoirty) but take it from its trusted partners for getting cheap price. Have read ev ssl certificate benefits at one of the ssl certificate authority partner's blog post https://www.clickssl.net/blog/ev-ssl-certificate-helps-to-increase-revenue-and-profits

That type of fonts which will help to make content more attractive and make fonts sharp for easily reading that comes with absolutely free of charge. But I don't think free Chinese fonts with high quality will be easily get.