These coins and projects are very promising and this is the value they have
Do your research and find out about the cool things these coins are doing or will do. Research their team, company, plans, proof of concept, products, partnerships, etc. Then make your judgement about their value or future value.
Most of these can be bought with bitcoins at exchanges like Binance or Kucoin which are the best places in my opinion to buy alt coins.
Alt coins with exciting and promising projects like these ones are my favorites so far. What do you think?