XLE
Energy Select Sector SPDR Fund
stock NYSE ETF

Start reading and learning, there are lots of good resources,  kiplinger.com, MarketBeat.com, Gurufocus.com, 247wallst.com, morningstar.com, theStreet.com, investopedia.com,  investing.com, Streetinsider.com, & SeekingAlpha.com or Zacks.com, to name more than a few.
Also I suggest, as you read, make a physical note of stocks or funds that interest you. Follow them. There may be a point in the future you might want more than just Index Funds or Target Date Funds, Make a move to high-yield dividend assets to build a more secure passive income stream..
But, of course I do agree with buying frequently. VOO or there are at least 7 index funds (starts with) XL* under $100. Buy 1 (or more) each week, by-monthly or monthly till you have at least 50 shares each. You can also look at Target Date Funds too. That's an excellent start 👍. 
Interesting factoid that motivates especially young investors, is 
"the balance growing without doing a damn thing". It's the difference between buying fractional share of VOO & lots of full shares of XLF or XLE.

Start reading and learning, there are lots of good resources,  kiplinger.com, MarketBeat.com, Gurufocus.com, 247wallst.com, morningstar.com, theStreet.com, investopedia.com,  investing.com, Streetinsider.com, & SeekingAlpha.com or Zacks.com, to name more than a few.
Also I suggest, as you read, make a physical note of stocks or funds that interest you. Follow them. There may be a point in the future you might want more than just Index Funds or Target Date Funds, Make a move to high-yield dividend assets to build a more secure passive income stream..
But, of course I do agree with buying frequently. VOO or there are at least 7 index funds (starts with) XL* under $100. Buy 1 (or more) each week, by-monthly or monthly till you have at least 50 shares each. You can also look at Target Date Funds too. That's an excellent start 👍. 
Interesting factoid that motivates especially young investors, is 
"the balance growing without doing a damn thing". It's the difference between buying fractional share of VOO & lots of full shares of XLF or XLE.

Webull seems to have a very interesting risk management program that assigns different margin requirements for very similar things. For Oil and Gas for instance: RIG is 1, EQT 2.22 HAL 2.5 OXY 3.33 SLB 4 XLE XOM both 4.
Most financials for me are 4 dtbp, but KRE is 2.5, and SOFI that you just mentioned for me is 4/2. The fact that it's telling me I get 4x for SOFI that you get NO margin with a large account is insane. Perhaps they customize some of it to experience level, or your own success or failure with that particular stock? I never traded SOFI, but it's right there as 4/2 DT/ON, so that implies that these numbers are somewhat personal, and not all universal for everyone. FAZ and FAS are both 1/1 for me, which makes sense. SOFI has huge daily volume (68 million shares daily) so that can't be an issue, or the only issue.
Just checked some of my dividend stocks, no real pattern: ECC 2.22/2 OXLC 1/1 ORC 1.67/1.67 ARR is 4/2 GNL is also 1.67/1.67 and OCCI is 1.33/1.33. Two of my ADR's show different numbers YRD is 1.33 while LU is strait 1.
Anyway, I don't think there's anything to activate or be done. They have a system that makes pretty good risk management sense, except for you having 1/1 for SOFI. Not a clue about that.