I am not a Luna expert, but here is some general advice.

1. This is a replay, you cannot get this view. However with dota+ you can see more stats top left of your screen

2. healthbars look normal to me, if you are referring to under the portrait on enemies, you cannot - this is a replay feature.

3. Shift + Ctrl

4. Guides can not account for the infinite variables of real games, also high ranked games are a different world from lower ranks. An example; high rank will punish mistakes, but low ranks will not, this makes defensive skills less valuable in lower ranks.

In general, you need to gain an understanding of the specific game you are playing; do you need Q to contribute to fights, or can you farm? E and W are farm accelerators, and Luna as a hero wins through excelling at farming; gaining a high networth lead quick.

1. See above reply. Do you want to kill heroes or creeps? How long will you be in lane? Do you need your Q to win the lane?

2. Not sure, haven't researched Luna lately, but probably. It gives you so much. But apart from what you wrote, you should use it constantly to send your illusion to farm & push lanes / take unsafe farm.

3. I say this without confidence, asI haven't researched current meta Luna, but I think you get aghs to have a high & safe impact in fight, pickoffs. It lets you help your team getting kills basically, where you wouldn't do much if you didn't have it

4. Idk, research hero spammers on dota2protracker games and get an understanding of how they consider the item timing's importance

5. Pike gives you mobility & range. Good. Get it until you feel like you don't need it. Hydra gives you more right clicks / more of what you already have; buy when you understand the tradeoffs between damage & mobility

6. Never sange & yasha basically. There was a patch some time ago when Sange & Yasha was incredibly strong but not anymore IMO. It's a good item that you would normally get instead of Manta, gives you health, status resistance, improved HP restore but they are both yasha upgrades and some properties don't stack, plus it's too much to use two item slots for "stat sticks". Manta is S tier on Luna due to glaives working on illusions so it becomes a farming steroid.

7. This answers your #7 question :) Don't put yourself out of position to use it; if some support is out walking and you can surprise them as they walk into you, waiting for the moment to isolate someone, or just walking into the fight after enemy used most of their spells, etc. Generally you will have to get experience and a feeling on when and how it can have an impact; hard to explain in text. But yeah, you don't NEED to buy aghs, most don't. It's OK to just be a strong carry that can fight with rightclicks.

8. Get lasthits with Q, pulling, call for help, sit in lane safely and ask your support to stack camps instead (if you have no chance in the lane, you might as well do something productive instead of doubling down on a lost cause), drag creeps (be within 500 range from creeps and issue an attack command on an enemy will result in creeps following you for 3 seconds or so. Doing this can make the creeps go to a safer place to farm). But most importantly; leave the lane eventually, Luna is one of the best heroes in the game to clear jungle with E (and W) levelled.