If you will go to google and hit where can you buy bitcoins, it will direct you at some point to coinbase. Coinbase is the first exchange I tried to explore last May 2017, my first time hearing bitcoin. But, there's a friend of mine telling me that I should not try and go try other exchange than coins.ph, since it's a wallet that is used by many in my nation. If you have a local board in this forum, it's best to post this in there so they can assists you better. But, I recommend coinbase since you can put your card on your account on their wallet to buy bitcoins. Take note that it have 25+million customers worldwide.
https://www.coinbase.com/
EDIT:
I have paused trading for 4 years now and have forgotten everything (90%)
now I want to join back. I'm interested in METAL . I looked at coinbase but they don't offer METAL.
Any idea where I can buy METAL + I need a good offline wallet. which offline wallet do you recomemend ?
Just saw this one. You can buy METAL in binance. Look at this
site and you can see exchanges that lists METAL.