i start off machete and 5 pots. i usually farm the jungle/gank until i have at least 1k gold and when i b, i buy madreds and ruby crystal. if i got ****ed up before i have 1k gold i just finish madreds and get boots if possible. then i just keep farming/ganking and i finish warmogs. then finish boots or if you want damage get brutalizer. if you need more tankiness get the ruby crystal before long sword or just build a phage before brutalizer. after that get whichever one you didnt before. farm/gank etc finish bc and frozen mallet.
end game core build should be boots, warmogs, bc, frozen mallet. the last 2 items are situational. if the enemy team is heavy ad i get randuins and sunfire. if the enemy is heavy ap i get a maw and last item is whatever the hell you want.
look at my match history if you want a visual of my build.