Great tips. Selling at the peak and buying back in on the dips is a skill. Something I'm working on right now. It's been a process.
I'd also say never to risk more than 5 percent of your portfolio on a single trade. Diversify. Research the coins that you want to invest in. Join the coins Slack. Check coinmarketcap.com. Go to their website. Read their ANN page on bitcointalk. Look at the the circulating supply. The market cap. See how much was premined and kept for the development team.
There is so much to do that it becomes pretty fun looking at all these different currencies.
These are all absolutely great tips also. I would definitely recommend each one.
It is great fun though isn't it. At first it can be a serious affair but then you can get truly into the joy of it all!