Hi @kirthig
Welcome to MoT! Security is a very broad spectrum so what kind of security are you looking into?
ISTQB Security is defo not going to cut it.
If you want to start out in security you can do online test labs to practice skills such as:
They got learning paths to develop your skills and are a very good beginning.
After you’ve done those you can probably move towards HackTheBox
OWASP is a great source of information about security also. Mobile, API, WEB you name it.
If you wish to practice your skills on real life targets, there is this thing called " Bug Bounty "
Online platforms where you can hack real companies and if you’ve found a vulnerability, you’ll get paid for it. Some examples:
Make sure to read the in and out of scope! 
Certifications in IT Security are kind of “meh” depending on the certification.
You have the EC-Council certifications but people often laugh at it “CEH” → Certified Ethical Hacker"
People tend to name themselves “Uncertified Ethical Hacker” as a joke towards CEH, because it doesn’t really add any value.
What does add value if you are looking to work as a pentester is OSCP and some others from OFFSEC:
These are super hard 24-48 hour exams. But they are really good!
If you now tell me you want to do security testing on hardware then I wrote all of this for nothing
Nah but I don’t do anything hardware related myself so I can’t really give advise on this.
Neither social engineering etc.
I would defo start following some cyber security experts on twitter, mostly bug bounty hunters because they often write write-ups of their hacks and those are such good learning materials.
Same for disclosed reports on: HackerOne
Disclaimer: If you are going to spend only a few hours a week on this, I can already tell you, you’re not going to make it. It’s a lot of content and continuously evolving. It’s not something that you can follow a training and done. Since there are always new frameworks and technology, new patches and fixes for vulnerabilities, you’re going to have to spend X amount of time to stay up to date with the new content, which can be very overwhelming. I’m not trying to discourage you here but this is just the reality. I’ve been into security since I was 15y old and I still don’t know everything, even though I spend a huge time of my free-time reading articles, write ups, doing online boxes/labs etc.
So if you are looking for an end point, there isn’t one! 
Hope it helps you a bit.
Always happy to discuss it further, if you have more in-depth questions.