The easiest way to get flux which is available to any players, is mining primordial flame and shape stone. The only things you need in order to mine efficiently are bombs, and a mount with 90 speed.

You probably always want to mine in Dragon Fire Peaks, but you shouldn't enter uber-portals over and over till you get one close by. If you don't see DFP on your map, just mine your way over land in any direction until you do see one.
The next best biomes for mining are in order as follows: Candoria, Desert Frontier, and Cursed Vale (Cursed Vale is in the list just because it has somber souls). If there isn't a DFP in sight, just head to any of these biomes and you should be able to get plenty of ore.
If you have high enough power rank, you should go to U7 Igneous Islands. There, it is easier to find lots more ore than in uber-worlds.

If you are a new player, you will most likely have to start off by mining with your lasmerasy. But once you have enough for 10 bombs, I suggest that you never use lasmerasy for mining ever again. Bombs are easy to get, and are really fast to use, which allows you to get more stuff from mining at a faster rate. Now for how you will want to use your bombs.
When mining with bombs, try not to use more than 2 bombs per vein of shapestone, or 3 per vein of primordial flame. You can and should use extra bombs if there is a lot left-over after using 2-3 bombs; but in general, it is not necessary, and may be less efficient. I have no proof of this, but I think that using 1 bomb for 1-3 shape stone, or 2 bombs for 1 primordial flame isn't necessary; though one bomb for 4-5 shape stone, or 2 bombs for 2 primordial flame should be fine.
Note: Where you throw your bombs is very important; you always want to aim your bomb at the place where it will take the most ore out in one shot; or in the case of primordial flame, you want to aim the first bomb in such a place, as you think the second bomb will take out the rest of the vain. This is a skill that comes with practice. That in mind, don't pay so much attention to your aim so that your mining becomes slow.

Article by Firephoenix544
If you have Boomeranger, use him. His bombs explode 5 blocks up, so dig 5 blocks from the top of the vien, place the bomb, and the entire vein will disappear. It's a really neat and extremely quick way of mining that doesn't even take resources to do.

For radiant shard farming, It is a "must" to have wings. I also recommend that you only farm radiant shards when you have a group to farm with. It is easier to find a group on Friday when there are 50% more shards so I recommend only farming radiant shards on Friday.
The best place to farm radiant shards is in Sky Realm. You can get into SR by making a portal and placing it in your club world, or just joining a club that has one. It is now possible to farm Radiant shards in the new Cursed Skyland portals introduced in the Mantle Of Power update, but it is better to farm them in SR just because SR only has lairs for radiant shards; whereas CS has other biomes.

Shadow Tower is only useful for get Shaper's Visions every week; that is, until you get to 5000 PR. Once you get to 5k PR, you will probably want to use your titan souls to get Shaper Keys. Really, ST isn't a source of flux anymore so much as a tool to obtain higher PR. If you are low PR, you will probably only get about 4500-9999 flux a week from ST. Once you are high enough PR to get more than 9999 a week, you will most likely want to farm ST to get Empowered Jem Boxes and SKs. So I will start this: ST is only a little extra flux, not really something to farm.

Another usefull way of getting a little extra flux, is by completing the challenges every hour. Though, completing challenges is only worth while if you have a class that has the bonase of that challenge, and if that class can go to u6-7 adventure world. If you have classes that have these requisits at the time of the challenge, just go and get the four lesser dragond caches and you can get an average of 3.5k flux or some dragon coins. Not bad if done for 10 minutes.

So far I've only told you what you need to farm, and how to farm it; now I will tell you how to sell it and how to get the most out of what you've farmed.
First of all, you need to know what are the best prices at which to sell what you've farmed . The best price per item is as shown below.

The numbers are presented in order of Item/flux.

• Shape Stone: 1/1.8 (Will only sell at this price on Sundays, but it is always good to check befor selling!)
  
• Primordial Flame: 1/20 (Like SS, it sells at it's best price on Sunday usualy)
  
• Miner Trove:1/75-100 (Like all mining stuff, they are usualy best sold on Sunday. Miner trove prices are highest on box opening leaderboard contest weeks.)
  
• Radiant Shard: 1/3-3.2 (Wednesday is the day to sell them)

I suggest that you always monitor the prices of the different items you have to sell; because the market can often be very volatile, and prices may change greatly and quickly; but in order to get the most out of your work, you need to be aware of those changes. Also, always check the general prices of the items that you're going to sell before selling them; this will make certain that your stuff will sell in less than a day (depending on the item, things can sell in less than 30 minutes). If you try to sell your stuff at a price higher than what there is on the first page, your items will take various ways to sell--if it sells at all that is. "Then why did you state the prices above" you say? I put them there so you know what are the best prices you can get. Some people just look at the first page on the market, and sell at whatever the price is right after they finish farming. Sometimes they sell at even less than what is stated by the market so that they're stuff will sell faster (A lot of people doing this, BTW, is what make prices drop in the Trove market; the prices settle down to a new average when people aren't willing to sell their stuff at any lower than that new average). Doing this, is not only dumb but waist-full. The prices on the market can go up to two times greater on one day than they are on an other. If you happen to be farming on the day where that resource is most abundant, every one will be farming and selling what they farmed. As a result (for the reason stated above), the prices plummet . So essentially, to sell your stuff right after you farm can waste up to half of the flux ou could have gotten. Do as you please, but remember this: "good comes to those who wait."