

Check if there’s alternatives to what you use in Windows, or if there’s a Linux version. Decide if you need to use the windows program, or if the Linux equivalent will work. There may be a learning curve to using a different program, but I haven’t yet really found anything that doesn’t have an equivalent that isn’t a program paired with hardware that will only work with each other.
I’ve used Linux for 15+ years.
Install from the repositories, if it isn’t in your “app store” or installed using apt or yum or whatever your distro package manager is, don’t bother with it until you’re more familiar with Linux.
Your system is 99%+ of the time going to be secure as long as you don’t install something sketch. You need to install it, it won’t just happen on it’s own, things can be hidden behind copy paste instructions so be sure you have a good idea of what each step does if you’re doing that (I’ve never come across this in the wild, FYI). The other small percentage is a bug or something in packages (see the xz debacle) which you have little control over. The best thing you can do is just keep packages up to date.