I need some advice, I had some crypto a few years ago and then sold it and made some good profits and I am now planning to buy some crypto once again and I admit that I am outdated on the crypto world right now. Can someone give a brief explanation of what DeFi is and what are your top 5 coins/tokens and where do you usually trade it. Thanks! 
I think it isn't bad time to start buying, but better will should come soon, BTC correction isn't finished yet and it is very much likely that another BTC drop will lead to even bigger drop in altcoins,
I think it should be possible to buy alts priced at least 30% lower than today.
But there is a small chance some alts won't be cheaper so I'd put about 10% of investment capital into todays purchases