A simple slow moving recipe I used for many swirls was 100% Olive Oil soap. No CO, no Castor. Just plain old Castile soap (not using pomace OO as it traces very fast), using the least expensive Olive Oil I could find at Sam's Club or Costco or other grocer.
As long as I did not do HP and kept my CP temperatures average room temp, I had plenty of time for intricate swirls with this soap. I started out using default settings in soapcalc, but later moved to less water to prevent the warping that occurs with high water recipes. (Soap bars would warp and bend during the cure.) They get rock hard after a long cure, but the long cure is a drawback if you want to use the soap earlier. However, when the goal is to practice and perfect intricate swirls, it's my go-to recipe, because I am in no rush to use up new soap when I have so much already.
Of course, some folks hate Castile soap, so if that's an issue, there are are other recipes that are slow moving and you are getting suggestions for some of them. I tried a few from an internet search when I was new (vegan, palm-free, yada yada) and Castile worked best for me. You can even do a low CO, low Castor with the rest being plain (not pomace) OO and still have slow moving. So 80-85% OO (OR a combination of OO & HO Safflower or HO Sunflower or HO Canola if you can find them) + 12-15% Coconut Oil, and 3-5% Castor (or 3% Castor). You could sub Avocado oil for some of the liquid oils, as well and it would still be slow moving (say around 30%). (By the way, HO=High Oleic.)
For me, I tend to use a low SF, and a mid to high range lye concentration, so around 1-3% SF and 33-35% Lye Concentration (sometimes higher, but I don't recommend high range for a beginner).
Always run any recipe through a
lye calculator to ensure you get the correct amount of lye for a given recipe. I always use Lye Concentration, which is another way of saying Water to Lye Ratio. I don't use Water as % of oils, at least not since I was a beginner & it was the default setting for the
lye calculators I used in the beginning. Now I use SoapmakingFriend calculator and can customize the settings to my own preferred defaults and that saves me a lot of time when it comes to designing a recipe. But if you prefer another calculator, that is fine, however I recommend avoiding the default setting of water as percent of oils setting and changing that to Water to Lye Ratio or to Lye Concentration.