Try to always use power attacks with dual wielding and 2handed, even with 1handed weapons, also to be able to unleash power attack after power attack try cooking, the vegetable soup regenerates 1 point of stamina and health every second for 720 seconds(12 minutes) and you can use power attacks even with 1 stamina, to get the ingredients fast just check out all the farms that uve discovered

dont power level non combat abilities early on you'll end up lacking damage and protection,
if you've gotten the armor perks that give you bonus protection when wearing a full set of armor always wear your helmet in combat, just attach it to a hotkey,
when fighting dragon priests with a melee character if they are running away from you alot try to trap them against a wall and alternate attacks and bashes to keep them staggered,
when fighting multiple enemies back away to a door or a tunnel so u can fight them one at a time
dont mix heavy and light armor pieces thats [censored] xD,
its not a good idea to put perks into skills like speech and lockpick before you have leveled up your combat skills,
if you want to level up combat skills faster dont take companions with you,
if your character is not a mage its a good idea to always keep some high level magic scrolls some times they come in real handy,
if you want to stock up on soul gems without buying them go to dwemer ruins
when fighting giants at early levels just circle around them and hit them only while they are recovering from an attack
thats it for now xD