Keep dying in T1 maps

Ok, I will try and find something. All the guides I could find didn't really give much guidance from someone starting apart from how the final build looks like. Is there a place I should be looking at apart from poe.ninja

You have no life mods on any of your gear, each piece of gear should have a mod granting you life, preferably strength on it as well. You won't get anywhere with 2000 max hit points in maps, should be at least 4000 at a level 75.

I don't see any way to get fortify in your build but you have it in your ascendancy? Maybe I'm missing something but you need fortify if you are getting the Unstoppable Hero in your ascendancy.

Nothing seems to fit with the way you are building. Meaning you have Smite so you are dealing 50% lightning, 50% physical. Your sword has leach which works off physical but you're cutting your physical damage in half making it less effective. You also have an elemental damage support gem which is only boosting half your damage since only half is lightning. You have a Purity of Elements support in your damage skill chain as well which is literally doing nothing for your damage, put that Purity of Elements somewhere's else if you need it. You also skipped the sword passives in your tree, Blade Master and Razor's edge. You have a sword with crit but it doesn't look like you are doing a crit build. Can't see anything that really makes sense.

You can try and rework your build and make it a little better but you probably won't get far with this character since we're nearing the end of the League. Maybe learn a few things and try again next league. If you want to learn the game watch some Youtube streamers, Zizaran has some really good tutorials, much better than trying to learn by reading those builds on the forums, which usually aren't that great.