Based on the best streamers I watch like @The-Atog-Lord, @ChubbyRain and Brian Kelly, a thing which they are really good at is to always thoroughly consider their options before making a play and also to plan for the worse (because things can go horribly wrong quickly in vintage). Sounds easy in theory but so hard to do when you play yourself. Another important thing is to always have the old card-frame version of every card
You can block with a Mishra's Factory and use it to pump itself.
You can activate an Orchard on your opponents end step so they don't get an attacker the turn before you Oath.
(not explicitly vintage) +ing a planeswalker is a cost, so you can cast a Jace and + it if you think it will get bolted.
This plays out as you cast a Jace TMS, hold priority +2 it then pass priority. They then bolt it. Now your Jace is alive, at 2 loyalty and at that point the fateseal resolves.
I'll keep adding to this thread.
@kistrand To piggy back on this, plan for the worst case scenario, but don't always act like the worst case scenario is the case. For example, if your opponent is on blue, has drawn some and has 5 cards in hand - he MAY have FoW, so you have to carefully consider casting that clutch spell. But if you DON'T cast that spell, and have nothing you could topdeck to push the spell through next turn, then not only did you virtually give them FoW in their hand, but you also gave them time to dig more and actually find FoW.
Sometimes they have the stop, sometimes they don't. Sometimes you cast your spell and they counter and it seems crippling (but if you held it in your hand, they'd STILL have the stop, so does it matter?). If you never cast the spell out of fear of a counter, then they ALWAYS have the stop, whether a counter is in their hand or not.
Sequencing land drops and spells is a skill many still lack in mtg in general.
spell sequencing: For one, It took @Smmenen writing an entire book on how to play Gush properly before some people caught on to how good the card is outside of Grow.dec or Gush Storm. (Turns out, Gush was THE blue deck)
On lands: I still see players making the mistake of cracking one for a dual as soon as they play it, (many still think "thinning" your deck is a valid reason) unnecessarily giving away info and opening themselves up to wasteland.
Many times players lose to themselves, making the wrong land drop turn one.
@BranDawri Also, if two Oaths are in play and an imbalance of creatures exists, they will both trigger. At this point, you can respond with Forbidden Orchard creating a further difference in creature amounts. When the first one resolves you can evaluate whether you need to use the second Oath ability. There are a few iterations of how this plays out, but you get the picture.
@griselbrother Cool, thanks for the input!
You're welcome, I'm glad you're with me. It would be a pretty bad article on tips and tricks if really basic stuff was to be included.
Knowing how to maximize your use of Engineered Explosives against Sphere effects and Chalice.
Most people are aware of using colorless manner to get around chalice, but also paying two or more of one color can play around chalice ( and Misstep if explosives on one counter is needed).
Also being aware with a taxing effect, you can announce x to be less than the number of counters you will need and use the tax as a way to add extra colors to the payment (ie. announce x is one with Thalia in play and pay UW for your explosives to have two counters on it to kill Thalia)
There's a technique called 'Walking the Dog' with Flusterstorm. Also if you put your opponent on 2 good spells in lets say a 7 card opener and you feel you have a slow start it may be correct to counter (Force let's say) Lotus. Especially if you know what your opponent is on. Mana Crypt is sometimes a similar decision, especially against Shops or formerly Eldrazi. The decision gets easier with more information, and even easier if you are playing blue and have 4-6 textless cards to pitch like Skillstep and Flusterstorm.
But even against a blue deck who has Lotus, Mentor, any Blue Land, some mess of Flusters and Skillsteps. With perfect information you would Force lotus.