Some people play it safe and cover all bases, bases being social media platforms. You can do that, at the cost of having to manage, update, and promote yourself on all those platforms. Will the rewards/returns be worth it if you cover all platforms?
Most people will choose their preferred platforms, which typically are platforms which they themselves use the most often.
Some use the business card approach, some use the sticker approach, some do both.
What others do may not yield the same result should you follow their method. The best would be to do what is comfortable for you, according to your own preference.
Since you claim to be just starting out, perhaps it's a good approach to keep it manageable first, so you don't have to overdo yourself trying to keep all your platforms current. As you grow then you can decide if you should expand yourself.
For myself, I did not even plan that far at all. It was just YT, posted vids for fun, then it started to pick up, so I just setup a page on FB since I'm always lurking there. After that, someone was using my logo on IG and people thought that was me, so I had to put myself in IG. As for the other platforms, I don't think I will be on them, although I did make a Twitter account, just cause I was bored. Thanks
@RoninK6 being my one and only follower there. LoL.