I would like to mining on hardware that I already have and working just fine ... but I guess the only coin I can mine with it is testnet coins ...

Mining rigs require a lot of research and investment. You're much better off buying and HODLing Bitcoin if you don't know exactly what you're doing.

Most people assume that mining is as simple as getting a rig and churning out huge profits. That's not always the case. You have to consider your electricity costs and various other factors. You could very well end up operating at a loss.

I do not prefer mining this time but this is the right time to buy Bitcoin why? It is because Bitcoin price is fall from 7k$ to 5.5k$ and if my experience in Bitcoin will prove me right sooner or later Bitcoin price will exceed 7k$ USD and if you happen to buy Bitcoin now at 5.5k$+ then you'll profit 1.5k$+ instantly.

Ok, i think if you already have this mining/hardware before the price kicks it is good. You can always use that until its lifespan and as long as you benefit from it. BTW im a newbie, what is this tesnet coins?

buying is the easiest thing to do, it is also the most profitable thing to do, and also safest thing to do!

right now bitcoin is in a dip which makes it a good opportunity to buy it, you will make a lot more profit that way and you will never have to worry about costs of mining, the difficulty going up, your investment giving you less profit, .... when buying you can always sell fast if you see any kind of drop or something but in mining you can't sell your equipment if it stopped being profitable and turning it off is like wasting money.

with that said mining can be a good and kind of a passive income too. but only if you have cheap electricity and know what to do. for example in case of altcoin mining you may have to switch between coins a lot to keep it profitable.

|i think i buy bitcoin then i play in gambling with investment site to profit and earn and i get trading also.

If you happen to have some BCH sitting around from the hard fork, then the cost of Bitmain rigs just got a lot cheaper.
Assuming they let my order stand, I ordered an Antminer L3+ for 1.4 BCH
This youtube video has a good overview of how you can use it to mine.
In particular, there is a pool that switches between coins to get the best return
https://www.youtube.com/watch?v=eTwk3zHkCqI

As others say, cheap electricity is key.
In my case, it is included in my association fee, but I can only run one rig.

Keep in mind that these rigs are loud. An L3+ is 70DB

investing in bitcoin simply takes time and so does altcoin. the right choice is to trade. I think that's the best thing at the moment. and I did that

I prefer to just buy bitcoin and hold in for long term. I think it is more profitable in the long run compare to assembling a mining rig not to mention you dont need to be charged high electricity cost due to high consume of mining rigs. Also mining bitcoin nowadays is not profitable as it is in the last few years. Its difficulty discouraged many aspiring miners to mine bitcoin. As for just buying bitcoin, you just need to spot a good entry point and you are good to go. Come back to it after a few years or you can add some monthly or occasionaly. You dont need to worry if it dips or some are panic selling because your main goal is to sell it after a few years.