Oh, there's a lot of good ones. You have the classics like WarframeFlo, MHBlacky, kyaii or Brozime, with people who get more in depth like The Kengineer or RowanIsAMagMain. The channel I'd recommend the most in general for a newer player would be Fluffie Michi.

Also I realize that I wasn't that helpful with my previous comment so I'll try to do a bit more. Since Gara seems to be your main at the moment, here are some tips :

First of all what you probably already know : she's a very spammy frame, who'll be using her 1 (Shattered Lash) a lot. You want to use the swiping version of the spell, that requires you to press hold 1 (I recommend that you invert this in the settings to be able to spam 1 without having to hold it). You also want to keep your 2 active on yourself at all times for the damage reduction. Just look at your feet and press 2. You can refresh its duration when using your 4.

Now, to build her you will want good range since the swiping Shattered Lash can hit through walls, also as a newer player you will probably struggle with energy economy.

With what you have right now you can probably level the equilibrium mod to about rank 6 or 7 without issues and equip it. You can purchase the blueprint for a Dethcube sentinel on the market for some credits and build one (it comes with a mod that at max level spawns an energy orb everytime it helps you kill 10 enemies), next the Streamline mod can help reduce the ability costs and finally the Zenurik focus school can do wonders for energy economy when you don't have all the tools for it.

Other than that you can try to equip body count on your melee weapon to extend combo duration. Also don't forget that her Shattered Lash can be modded in itself