You do not need to break down junk items to get components by hand the game will do it for you if the junk items are stored in your settlement workbench or inventory.
You can zoom in on the pip boy by right clicking.
Fast Travel in Power Armor doesn't use and Fusion Core battery, and you can still fast travel with no charge in the core.
For Power Armor: sprinting, strong melee attacks and VATs drain your Fusion Core faster than walking or standing still.
( "T" for PC, "Y" for Xbox, "Triangle" for PS4)
To force a companion to equip, or apparel switch to their inventory in the trade menu, and a button will show up to have the npc equip the item.
There's no shortage of things to take down and no shortage of points to get strong enough to do it. The game's enemies don't scale with you, but they do get harder farther from the start, and the farthest away points of the map have level 50 enemies.
You can tag specific crafting materials by going into your junk section in your inventory, and switch to material view.
Some companions can pick locks and hack terminals for you.
Try to always carry a weapon of each ammo type, that way you are less likely to be completely out of ammo.
When hacking look for ,(), ,and with anything in between the brackets, clicking the leftmost bracket will reset your attempts to give you more tries, or remove dud words from the list.
When Leaving your power armor remove the Fusion Core so no one will decide to use it.
The Lone Wanderer perk still provides bonuses with Dog Meat as a companion.
Pickpocket enemies with power armor to steal their Fusion Cores, this will cause them to leave the armor, and you can steal the frame.
Sell Fusion Cores to traders before they run out, you will get much more for a partially charged core, over an empty core.