Pitch

I've recently been working on pitch, im following the course. I was wondering what else i could do, right now im playing on a keyboard the notes and trying to match them. Are there any other exercises you could recommend or other things i should do. I am also using a pitch app and i wanted to know if there was any otherway i could know when im on pitch, i do hear this joining of pitches sometimes. 

It sounds like you've got a good routine! The purpose of using a pitch app (or chromatic tuner) is to give you visual feedback of your pitch. An additional step would be to also memorize the feeling and sound of consonance (rather than dissonance) when you sing in tune. Over time, you can use the tuner less and trust your ears!

Here's an updated list of apps to check out:

You can use https://www.harpkit.com/online-tuner for reference pitches and https://tuner.ninja/ for a chromatic tuner. 

Pitch apps: http://singtrue.co/ for a well thought out system; also check out https://www.guidingtech.com/55792/wonderful-ios-apps-musicians/

Two similar apps (free to download and use most features - I wouldn't pay for the upgrade, though): https://apps.apple.com/us/app/learn-to-sing-perfect-pitch/id1409450884 & https://www.singsharpapp.com/

For songs: use https://www.smule.com/ or a similar karaoke app that analyzes your pitch in real-time.