What mistakes did you make, and what advice do you have for others to be careful?
What are the best and worst ways of storing a seed in your opinion?
One of the things I'll never forget about my journey to crypto, was when there was a system issue and all my seed phrases were saved there on the computer. I was a newbie to crypto and I was making money because of signature campaigns and white paper translations. My computer was suddenly reformatted and all the files were lost. I was so complacent that time, that I had to hide all the seed phrases of my accounts in 1 device only, I didn't have any back up copy and that time I didn't have hard wallet so what happened was that everything I worked on was gone.
Ouch mate, that's sad to hear. But that should have taught you an expensive lesson. And I hope you are now doing the right thing. It would be great if you state the current practice you are doing now with your keys and cryptos. When I was a newbie in crypto, I also didn't back up my first wallet or the keys inside it, but luckily I didn't stumbled any problem up until the time I gained more experience and start creating my very own back up.
The only memorable fail that I made was when sending a crypto. It was XRP. And we know it requires a tag right? This is where I messed up. Not only once but a couple of times. Damn. But eventually, I mastered it.