What’s your favorite exchange/DEX, and cold wallet? Why?

Hey folks, I hope you are all DCAing and HODLing. 🙂

I've had a bad experience with Coinbase and would like to not make the same mistake again. Currently I'm storing some coins on my Kraken Pro wallet, but will move it to a cold one soon.

Brief description of what happened: I developed some interest in cryptocurrencies last year, and on a whim downloaded the regular Coinbase app and bought some BTC and ETH. I didn't really know what I was doing, plus it was a bit of a thrill being part of this nerdy crypto community. Ended up paying like $12 total in hidden fees, and even though I only found out about it after the purchase, I didn't really mind this because the appreciation of stablecoins are pretty much a given. Around 370 days later, here we are. BTC nearly doubled and ETH value increased by around 50%.

I'm the type of person that prefers to make a mistake only once. Therefore, I'd like your input regarding both questions.

Btw, I'm inclined to buy SOL in the next week or so, so keep that in mind please. Btw, I'd recommend you folks to do the same. It's a solid project and the numbers don't lie. Cheers, and TIA!