IT Industry is very growing and promising industry where you can get many opportunities to make your career. Web design & development, digital marketing, software engineering, network engineering are some the growing applications in the IT industry.

In simple terms plagiarism means copying. It is the practice of taking other's ideas and apply it for our purpose without giving credit to them.

Amazon is worth for buying anything because of its smooth easy to return policy for 30 days. I prefer amazon to buy electronics and appeals.

With free and pro cloudflare plan, free shared ssl certificate comes. But how this ssl certificate works that you can read a form here https://www.cloudflare.com/ssl/

@solaro For less than $100 for wildcard ssl certificate check out https://www.clickssl.net/cheapest-wildcard-ssl-certificate-for-sub-domains

You should register on social media platform and join group related to recruitment in which you are interested. You should also join platforms like naukri.com, shine.com etc.

DDoS attack is one of the concern subject in the field of information security. This type of attack takes help of multiple resources to make an attack possible. How DDoS attack works you can read in detail from https://www.clickssl.net/blog/how-ddos-and-botnets-can-influence-network-severely

Yes, SSL certificate has expired.

No, you can't renew it because this free ssl certificate is limited to one issuance per domain.

Comodo is giving free ssl certificate for 90 days which comes with features such as 2048 bit signatures / 256 bit encryption,issued in minutes, no paper work will require. Checkout resource https://ssl.comodo.com/free-ssl-certificate.php

Checkout tool https://www.clickssl.net/check-sslcertificate

Going into IT is the best choice and being a web developer is the best profession but it is the thing of an interest. So first ask your sister, is she also interest to go for IT field. IT has bright future. The web designer is also one of the best profession if she has a creative mind.

Yes, we can sell books on the web with the help of platforms like :

https://www.webuybooks.co.uk/sell-books-online/
https://www.ziffit.com/sell-my-books
https://www.bookfinder.com/buyback/

If talking in general then every company will have to give 1 day in the week for R&D and testing. Because these are the factors which bring the business up and if the business will up then company automatically will grow.

It's the duty of company or HR. But if you are an older employee of the company then you should definitely share your thoughts with him about what company will think for about his work and alert him.

SSL protocol works on both keys public key and private key. Public key is accessible to all and used to encrypt the data but the private key is confidential to certificate owner. It is used to decrypt the message.

From below resources, you can learn more about these both SSL keys :

https://www.comodo.com/resources/small-business/digital-certificates2.php
https://www.clickssl.net/blog/encrypts-the-data-in-https-with-ssl-certificate
https://docs.oracle.com/cd/E19509-01/820-3503/ggbgc/index.html

You should apply HTTP/2 for your website for the faster connection. Read more from here https://www.v2ex.com/t/350927#reply13

By asking for extra money for overtime.

@Tiande Ok got it. No problem. You can also find other options for wireless headphone on the same platform amazon using filter option.