I think very important place in DeFi not mationed in video by Josh is Terra Ekosystem which was created by Terra Money which and Do Kwon the Founder & CEO of Terraform Labs and the whole Terra Blockchain.
Do Kwon created BlockChain that is to serve what the Cryptocurrencies really were created for. Terra Ekosystem has focused on creating algorithmic Stable coin and the main is UST - USD stable coin.
Terra Money was created three proltocols over the BlockChain, which are:
-Chai app for payments. Chai and KRT Korean Won stable coin have been already used in South Korea for payments for more 2 years.
article about Chai on loop finance
-Anchor Protocol for saving and borrowing money, where you can have 19,5% APY on Stable coin and borrow UST with really low interest(now it is about -3% and a few months back the interest was about +85% )by having collateral in bLuna(Bonded Luna) or bETH, they will add also bATOM and bSolana soon.
-Mirror finance for investing where you can mint a synthetic asset of US stocks.
Other worth to know about website and apps on Terra:
Starterra LaunchPad on Terra where one of founder is Do Kwon.
Coinhall a coingecko for terra Block chain.
Terraswap AstroPort and loop DEXs on Terra.
Other worth to know about facts on Terra:
Terra blockchain was coded in Rust.
Terra has #2 take into account the TVL: https://defillama.com/chains with only 17 protocols, not long ago there was only 13 and as I know there are more than 150 projects in underway.
I think adoption is still ahead of us.
Edit: good video about Terra Stable coins:https://youtu.be/KqpGMoYZMhY
I my opinion the ekosystem in very interesting and it is worth to have a look into it.
I have also a channel on youTube Exploring Crypto where I have some video about Terra and there will be more videos about it. I would appreciate a sub.