Capital losses are used to offset capital gains of the same type. For example, short-term capital losses can offset short-term capital gains, and long-term capital losses can offset long-term capital gains. If your capital losses are greater than your capital gains, you can use up to $3,000 of that difference to reduce your tax liability for the year.
For Plenty's disclosures on tax loss harvesting and wash sales, please see Plenty's general disclosures here.