Best crypto platform?

I've been trading stocks and options for years and dabbled in crypto while it was available on some of the platforms that I was using. I'm looking to get more into the crypto space, but I'm not sure what platform would be best to do this? Does anyone have any recommendations? I'm also wondering how seriously security should be taken when using one of these platforms? I'm currently using a laptop to trade; I'm not sure if there is really a great mobile application for crypto trading. I've seen and heard some pretty bad stories about platforms, so i am just looking to see what the majority of people out there are placing their trades through. Any input would be appreciated.