I realy want to buy Bitcoin i have 5000$ give good idea plz
if you only have $ 5,000, you don't need to buy bitcoin first now because if you buy bitcoin with $ 5,000, you will only get around 0.66 BTC, in my opinion now you better buy altcoin like ETH and then trade to get profit from ETH so you can buy 1 BTC later from your trading profit.
You can do that if you predict the price or bitcoin to rise. Unfortunately, no one can predict when it will happen again. So you better play safe and focus temporarily on the alt coins rather than bitcoin. Bitcoin still have the possibility to reach or overlap its price since 2017 from $10k.
For now, hold some of altcoins since there is no chance for bitcoin to develop nowadays. Maybe 8 to 10 years from now, but we're hoping for a fast comeback.