I still have so much fun in PoE after so many years
Same for experience gained. A higher/challenging map gives (in general) more exp than lower content (bigger monster pack size means more monsters to kill and more loot), but it depends on map-layout and density. On the other hand you will need more time to come through if the map is to hard. So if you're not comfortable or die to often (exp-loss) than just do the maps white without crafting them.
well said. Honestly, I can even be depressing for newbie's following Mathil, because he knows what he's doing and uses expensive gear and maxed out gems. ItsYoji is a good contact point, because of his funny/beginner-friendly videos. Learn the basics first, that takes long enough.
The beginning is the best thing ever! My tips for you is bind your left click button to Move only. Read about gem links and supports and how they work together. Get a quicksilver flask, it's going to make your life easier to get around. I'll keep the rest for you to figure out since there's so much beautiful, cool and fun things to learn and experience in Path of exile.

Nov
trade you can find a lot of cheap path of exile items
When you actually take your time and search stuff over some time/PM a lot of offline traders you probably could get them cheaper

Mar
poe4orbs:PoE 3.10 Delirium Witch Popular Starter Build
PoE 3.10 has arrived! Are you ready to take on new challenges? Take a look at the PoE 3.10 Delirium Witch Builds (Elementalist, Occultist, Necromancer) prepared by R4pg for you!

Dec
The way armor works is too RNG in Path of Exile
The problem isn't really map mods. The problem is that armor and evasion are not even close to as good as having a giant 'life' pool.

May
Path of Exile Skill Revamps - Part 6
It's only 3 days to the releasing of POE Incursion League, which is the core content of 3.3.0 updates. And GGG's Skill Revamps has proceeded to part 6, so I'd like to show you more details about Skill Revamps - Part 6

May
Path of Exile Level And Gear Guide
We all know that there are a lot of maps in Path of Exile, which can be used to level and gear. But you still need a detailed guide on how to do these step by step, so I am going to show you.

Oct
How do you get your sac fragments in Path of Exile?
If we're talking about day 1 atziri farming, you'll be mapping enough to reach a decent level ~75-80 and you shouldve collected a few sets with whatever vaal Path of Exile Orbs you have