So I want to start really working on my game to start climbing up the ladder since i'm stuck playing 50 and 100 plo 6m for a while and learned mostly with training videos and by playing, but reviewing my own hand histories in PT4 is something that I've never really done before besides checking out the big pots and occasional interesting hands.

So questions are pretty straightforward, how to start, what to do, which spots to look for and which filters to use and how to spot out leaks that actually make a big impact on the winrate.
Any feedback will be hardly appreciated. :)