Because I'm always relatively slow to make improvements to my earning, I've also only recently looked into delegating SPT.
What do you mean by delegating SPT?
Normally, you have to stake your SPT on your own. This increases your Voting Power (SPT Power), so that when you vote on Splinterlands you can remunerate the contributions higher. This will not cost you any SPT itself, instead it will usually flush half of the voted contribution back into your coffers.
Example: You vote with +1 SPT on a contribution. After the period of 7 days has passed, in which you can vote on the contribution with SPT, you and the author will each receive 0.5 SPT.
Very cool, right?
Of course, this is also fun. You can reward the best contributions and have an advantage yourself.
After a few days or weeks, however, it becomes quite tedious to read countless posts every day. If necessary, you have no time for days (like me at the moment, actually I would have to write a term paper for the university right now :D).
But there is the wonderful function of delegating. You can simply entrust someone else with your staked SPT. They can then do the voting for you and you get your share paid out every day.
This could look like this:
One of the best known curators is 
And it's really straightforward to delegate your SPT to them.
Step-by-step
1. Open the drop-off menu under your username
2. Open your wallet
3. Open the drop-off menu next to your SPT
4. Use the "Stake" function
5. Make sure that your name is spelled correctly and stake your SPT.
6. Now you have the same amount as SPT Power. Click the drop-off menu next to SPT Power.
7. As you can see, you can unstake the amount. But now we want to delegate it. So use the delegate function.
8. Be sure that you have spelled the name of the curator correctly. In this case it is . Now press Delegate.
The amount should now be delegated to
Which turnover can be expected?
According to my quite short experience, the annual turnover will be around 25% of the initial deposit. I get about 3 SPT per day on a deposit of about 4500 SPT. That is 3*365=1095 SPT per year, so about 24.3%. Of course, this value can fluctuate. The advantage is, this income is passive and can even be reinvested to get compound interest.
And it also counts to your daily SPS airdrop as normal.
Please note that I am neither a financial nor a Splinterland expert. I am still at the beginning myself and report here only from my experiences with the market. Nobody knows what the future will bring and in which direction the game will develop. So, like any other financial investment, there is always some risk involved.
If you are not yet a member of the Splinterlands community, feel free to join via my affiliate link. When you buy the Spell Book I will then get a part of the purchase price :)
https://splinterlands.com?ref=toheadi