Welcome to the forum!
It's always nice seeing newbies who already have good information about bitcoin and bitcointalk before joining the forum. If you can continue to learn, your knowledge of bitcoin will increase very fast. You have to be grateful to your uncle because he did marvellous to you. I however wish to react to some of the things you discussed below:
1) buy bitcoin and store it in the wallet for the next bull market to come. And he told me to buy it in the bear market and invest it for a long term investment for like 3_5 years period, so I am planning to invest for the long term.
At this time, I will advise you to eradicate the mindset of 3 to 5yrs holding in you. If you continue with the mindset, you may be cheated by the coming bull run.
But trading is more risk than investment.
Both are risky, just know what you are doing else you will hold for long term and in the end earn nothing.