The negative comments are harsh, but they aren’t wrong. As photographers, we should recognise and deal with the problems at the time, not try to fix them later, which takes hours of avoidable work.
But, this takes a lot of experience and nobody, regardless of their talent, is born with that experience, and sometimes it isn't even possible because we can't control what happens.
The trick is a mixture of choreography and viewpoint. The camera height and distance are changed to suit the situation, and zooming with a lens instead of with our feet makes that a bigger challenge than it needs to be.
When Boris Johnson was PM, he was always “normal” size in photos, and Rishi Sunak was always small and unimportant, but when Sunak became PM he grew at least a foot, simply because he now called the shots and the photographers knew how he wanted to be portrayed.
So yes, you can do it in PP if you need to, it will be a sharp learning curve and the advice to watch YouTube videos is 100% right. Not often but sometimes, we need to put things right in PP, it’s rarely the best option but at least that option is there, and with suitable hardware and software there’s very little that can’t be done in PP.
Let us know how you get on – there are some real PP experts on here (I’m not one of them) who can help you with this journey, and the ethos on TP is to help people, that's what we're all about.