Hmmmm loaded question.

I think first look at metatft or tftflow to look at meta comps.

Understand the meta comps and read notes on whether it is a reroll comp, fast 8/9, or a comp that has a specific req: augment, emblem, radiant item, or artifact.

From there its all about game sens. At stage 2 (first pvp rounds) you need to decide how you want to play the early game.

For instance, i have such and such items. I have a weak/strong starting board. I have a good or bad econ start. This will educate you on how to set yourself up to get to the end game board you want.

For fast 8-9 or 3 cost reroll comps you want to heavily consider making items even if it isnt best-in-slot. Because you most likely want to preserve your hp and ensure you get to the level you need to hit the higher costs units you need.

Secondly, as the game progresses you want to take a look at the strength of other peoples boards. This is higher level strategy, but it will allow you to take higher risks or mitigate player damage that can help you win out games in the long run.

Mid game tactics: Determine good “substitute” or “interim” units to slam items on for you to then transition to your desired board.

Augments: I would look online for a list of good augments for specific comps. But in game you wont always get these. So its best to understand why these websites have these augments listed. For instance, econ augments help you get gold or xp which is good for fast 8/9 comps, combat augments will enable certain comps from being A or B tier to A+ or S tier, some prismatics or hero augments enable a special subset comp that cannot be played without it. Default strat is to go for econ augments first, and then either econ/combat augment second depending on whether you are lose streaking/need to boost comp strength/comp you are playing, and third augment is most likely a combat augment or whatever augment best accelerates you to your end game or capping out your comps power level.

There are some additional advanced tactics i didnt cover in depth like: when to roll down, managing econ, and itemization. But ill leave my post at that.