No other coin can't replace Ethereum, not this year not next year. Yes there are some good maked platform coins, but Ethereum doesn't stand still, its Development goes on! 

Only hold now, if you sell you will lose.

As newbie you should read much and if you feel you lernt much about that, you can start to write here in the forum und share your knowledge with other members.

What about Decenturion I liked this project at beginning, it looks like really interesting and decentralized. But what it became now? The more money you have, the more authority you have in this State. Simply put, everything is the same like in the worst capitalist countries nowadays, just with some blockchain.

The States are not the whole World! Cryptocurrency is actepted in very many countries as assets, and in some countries as a payment  instrument.

For me is one hour a day investing in cryptos absolutely enough! But I am not trading, if u trade then u need sure much more time.

If you have thoroughly analysed this coin and really believe in its fiture, then HODL!

I think it's pretty funny that even the dictatorial small country Belarus allowed cryptos and even tax-free trading till 2023. And at the same time some democratic countries are again cryptos, maybe they are not so democratic as they tought?

Coin has its own blockchain, and it's ussualy minable.

Token is build on blockchain of other coin or token like Etherium (the most Tokens), Waves, Neo etc.

Do you mean Julian Hosp? Yes I am often looking his Youtube Videos, he is cool and experienced, I trust much in his opinion. His book helped me to understand better what is cryptocurrency and how it works! Thank u Julian

How can you make so fast conclusions, after only some defferent days in the crypto-market?