Search:

SEO - Search Engine Optimization
SEM - Search Engine Marketing

Both are useful to increase your business! One is free while another is Paid!

DuckDuckGo is prefered nowadays a lot!

Just search the same on google. you'll get the entire list for the same!

To Measure SEO Performance and Results Consider below things:

Organic Traffic
Keyword Ranking
SERP Visibility
Click-Through Rate
Bounce Rate
Website Authority Over Time
Backlinks
Page Speed

Keyword & it's position plays important role in this Impression Game. Also focus on searches!

If you optimize headers properly, it will help a lot in SEO!

It helps to drive traffic to your website from your social profiles. So if you're sharing useful stuff you'll get a good response.

VPN doesn't help you improve SEO results. It will help you access sites that are not accessible from your location. So it's up to you if you want to use it or not.

There are so many VPNs available...

Replace the links with relevant ones or remove them!

Google's John Mueller said guest posting for links results in unnatural links!

If you were looking for the definition of Java (Prog Language) I guess you got the answer. Is there anything else you want to ask experts?

We can remove the unwanted links which we don't create or created by someone to harm our website by spamming. Disavow is really helpful nowadays.