Yes @Goregrinder get the worms skill filled up asap.
You will be able to dig, in a single shovelfull, 5 worms, 3 redworms, 3 crawlers, 2 dung beetles, 2 cockchafer larvae, I've not had 2 rhinos in one dig yet, nor 2 mole crickets, they may be restricted to one per dig all the way.
I cant believe how many people DON'T max out harvesting skills as early as possible.
Advice to a new player, from me, and its not 'the best advice' or in any way prescriptive, (and its pretty much opposite to @Jvan 's advice, but thats the thing with this game there not often a definitive correct answer, especially when it comes to skill point allocation which depends a lot on personal play style) but it's just what i would do if i was starting again.....
.......so, my advice would be to fill up worms to 3/3 as soon as possible. Harvesting baits is one of the hardest skills to max out i think, and so you WILL be spending a lot of time digging.
As digging is gonna take up sooooo much of your time, you might as well have 3 points in it and so build up a decent amount of baits, i mean you'll dig more worms than you need, whether you fiill up the skill points or not, but the redworms, crawlers, moles, chafers etc will be few and far between. I'm not getting LOADS of the higher level baits, even with 3/3 points, but i dont think i could have spent all those hours digging if it was for single worm, single redworms, single occasional crawlers. getting 3 nightcrawlers in one shovel still gets me excited, and i am finally manging to build up ore thasn i can use. I havent had to buy crawlers or redworms for a long time now.
And for all those who say digging does nothing after 90%, some images from the last few raises I had before reaching God Tier, 100%.