If you really want to know the best then I would highly recommend you to complete the following courses.

1. Google Analytics – Google offers a free course to analyze the traffic on your website to plan an effective marketing strategy. After completion, there is a 90min test to qualify for the certificate.

2. Google Adwords – PPC and SEM are in huge demand. Ads are always the best way to market the business. Google provides a free course for AdWords certificate which is totally worth it.

3. Hubspot Inbound – Inbound Marketing is a rare skill which is difficult for a business to find. It’s totally free of cost and very essential for beginners in Digital Marketing.

4. Moz SEO – In digital marketing SEO is a very important skill to excel. Moz is the most updated SEO course right now which teaches the depth of SEO for free.

5. Udemy Content Marketing – Content is everywhere, so a digital marketer has to be creative with words. This course will teach you from basics to the core of content marketing.

That’s it for now. Above are the most preferred courses to learn digital marketing from. My personal advice is to start your own blog or a youtube channel to have practical hands on it. The more you practice by yourself, more you will come to know about the digital marketing.
Good Luck!

Mobile Responsive Websites are basically mobile-friendly sites which are designed in a way to provide the best user experience for mobile users.
Why is it important?
There are more than 4 billion mobile users and it is proved that a website is mostly accessed by a mobile device instead of a desktop or laptop. If you ever contact a  hire dedicated resources company then make sure that their developers are more concern about the user interface of the mobile structure. A smooth mobile website is an utmost step in website development.

In simple words,
Data is a collection of raw facts.
When we extract useful facts from a collection of data, then what we get is the “information”.

There are more than 4 billion mobile users. This proves why the business owner doesn’t think twice to develop an app to enhance their brand awareness among the audience.
There are many mobile app development companies who develop the exact application that you asked for or dreamed about. IT Companies like Finoit Technologies have helped a lot of small businesses to grow faster by providing them skilled developer team with rich experience.
In nutshell, a mobile app is must for a business to spread awareness otherwise their competitors would beat them easily.