this contract is probably just one of many. Guys, please think about this. Even projects with said clear underlying or backed up by real-life assets can scam you, what more meme coin projects without any utilities and clear fundamentals. Don't ever ride the hype if you don't know-how. Even those who have knowledge about it could fall and drown. The wise thing is to avoid investing in that kind of project wholly. Sure, they can give you some short time profits in a big amount, but it's so risky even riskier than some of the ordinary altcoins.
Hello and welcome to the crypto world. You're certified as a crypto citizen by buying bitcoin now hehe. Feel free to increase your knowledge about cryptocurrencies and please keep alert, guard yourself, don't believe other people easily, and always DYOR since it's a harsh world in here.
Regarding your question : 1. Can I sell my bitcoin on any other exchange?. Sure, actually bitcoin is traded on many exchanges. You can find this information on the coinmarketcap(dot)com. Wherever you buy it, as long as it's bitcoin you can sell it on those exchanges listed on CMC.
2. If I buy more BTC and transfer it to my cold wallet, does it just get added to my existing amount on the cold wallet? Or does it exist as a separate amount, separate transaction? Yes, it'll be added to your previous BTC. For example, if previously you have 1 BTC in that wallet, your amount will be added to 2 BTC, if you transfer another 1 BTC into it.
The first mistake was to expect to get a mentorship from others about cryptocurrencies. Frankly said, there's no one willing to do one-on-one mentorship without any fees in this sphere because the crypto world moves so fast and rushing. You can't expect people to direct you from the beginning and depend on them. In fact, you can only depend on yourself in this harsh world. It is okay to ask, to discuss but at the end of the day, you need to read and do your own research.
Based on my experience, I learned from the very basic, about Bitcoin. I watched youtube, I read articles, then I found a small local telegram group where I can discuss cryptocurrencies, I found altcoin and start to learn about airdrop and bounties, acknowledged about this forum and so on, it just goes on naturally. I always make sure that I learn a new thing every day. Actually joining bounties helped me or if not, forced me to find some information I need to be successful doing my job. It's not an instant way to gain some money, I need years of process to come to this place.