*Basics of cloud computing*
https://youtu.be/wtNA0csV95M

Cloud computing is the delivery of different services through the Internet. These resources include tools and applications like data storage, servers, databases, networking, and software.

Rather than keeping files on a proprietary hard drive or local storage device, cloud-based storage makes it possible to save them to a remote database. As long as an electronic device has access to the web, it has access to the data and the software programs to run it.

Cloud computing is a popular option for people and businesses for a number of reasons including cost savings, increased productivity, speed and efficiency, performance, and security.

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*MySql - Primary Key and Its Uses*
https://www.youtube.com/watch?v=fof6NODpBBs

A primary key is a column or a set of columns that uniquely identifies each row in the table. The primary key follows these rules:

- A primary key must contain unique values. If the primary key consists of multiple columns, the combination of values in these columns must be unique.
- A primary key column cannot have NULL values. Any attempt to insert or update NULL to primary key columns will result in an error. Note that MySQL implicitly adds a NOT NULL constraint to primary key columns.

- A table can have one an only one primary key.

Watch the video by Mr.Arun Prakash, Founder & CTO of GUVI to know more about Primary key in MySql and Its Uses.

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*JavaScript - Basics of Reserved Words*
https://youtu.be/mZrH0Mjqx6Q

In any programming language, a reserved word or a reserved identifier is a word that cannot be used as an identifier, such as the name of a variable, function, or label. Thus, it is reserved and cannot be used for defining any of these. This is a syntactic definition, and a reserved word may have no meaning.

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