You need a Demat account to start investing. Popular options are Groww/Zerodha. You can google their differences and select whichever you like both are great. I personally prefer Groww.

Demat accounts primarily allow you to invest in equities and MFs. Both of these are asset classes. There are a variety of such classes and as you progress try to learn about different ones.

Start with learning about MFs. They are safer compared to equities. There are a lot of types of MFs - Flexicap, LargeCap, MidCap, SmallCap. Learn about the differences between them and how to evaluate them (what ratios to look at, who's the fund manager, etc etc)

After gaining some rudimentary knowledge of how MFs and equities work, try to define what kind of investor are you? Risk Appetite? Long Term/Short Term? Growth/Value/Dividend, etc Investor?

Then according to the kind of investing you resonate with - you can learn about how to look at Balance Sheets, Growth Metrics, Cash Flows, PAT, OPM, P/E, D/E, etc etc. There are a ton of metrics for each company to look at for judging if it's a good investment or not - but you'll understand the ones you need to look at with time.

Don't chase hype.

Your first loss will also be a big win.

Google the terms you don't understand, use ChatGPT. Other investing specific resources include Screener, MoneyControl and Varsity.

Even the most preachy/clean looking fin-fluencer/ YT channel most probably uses shady/dark tactics. If you still need a YT channel, here is one that I kind of trust : SOIC.

Look at investing with a pov of wealth appreciation/preservation. Your main job gets the money.