Im new to crypto and have some questions.

Hey, as the title states I am a complete noob when it comes to the stock market and crypto. I want to move from the sports betting world into the stock market. Below i wanted to list a few questions. Thanks.

What is the best platform to buy crypto such as ethereum? (PayPal, Coinbase, Robinhood?)

What are crypto winters?

How long do you guys plan to hold on yo ethereum?

What even is ethereum and how does it’s value increase?

Should i buy at $2500 today?

Please feel free to roast me if these are dumb questions, thanks boys.