The Witcher

- Get the intelligence talent that lets you gather herbs first, then you can shift click every plant you pass when moving about to grab potion ingredients instantly.

- Prioritize strength and stamina talents above all others, intelligence too if you use signs a lot.

- From there the simplest way to go is to just upgrade sword styles, try to have a few points in fast silver before the end of chapter 1 even though you don't have a silver sword yet, trust me on this. If you want to be more sign heavy Aard and Igni are great, but the others shouldn't be ignored.

- Take the skill herbalism ASAP.

- Buy and read every book you can get your hands on. You need to learn about monsters and plants before you can harvest ingredients off of them, which you'll need to do for quests and potion-making.

- It's probably not worth spending points on any of the signs aside from Aard and Igni

- When you use a blacksmith, you're not a actually upgrading your current sword, you're making a brand new one

- Don't bother using any weapons aside from your swords. They really don't have a use beyond giving the enemies things to fight with.

- If you make a potion with a special additional ingredient, make all future potions of that type with the same ingredient, otherwise they'll take up a separate inventory slot.

- If you take long-lasting potions you can meditate to clear your toxicity while still keeping their effects active.

- Make sure to learn how to make Specter Oil and have a jar of it handy before the end of Act 1.

- In Act 4 make sure to save a Devourer's tooth.

- Get anything you need out of storage at the beginning of Act V, because that's the only time you'll have access it for the entire act.

- Get Aard sigh stun upgrade early, most enemies in game are not stun-immune, even bosses, and you can kill a stunned enemy in single blow.

- Also invest in group style, it awesomely reverses the situation when you're outnumbered(which is, to say, pretty much all the time) - the more enemies are next to you the harder it hits on all of them at once.

- Use potions all the time, ingredients are plentiful, also try to brew potions with secondary effect for extra kick(same color ring around all ingredients).

- Sell ingredients with chemical names(salts, acids, crystals etc) for money when you find some, brew potions from weeds and monster organs you collect, the difference in price is huge. Also grab all the vodkas you find for potion bases, buying it is too expensive and nobody minds you stealing the drinks from their home.