Question about Taxable Brokerage account and Roth IRA account

I have securities invested in my taxable brokerage account, and am preparing in advance to make a 2025 Roth IRA contribution. Since I would like to transfer money from my taxable brokerage account to my Roth IRA (as my 2025 contributiion), and essentially invest in the same security, then does that mean I have to sell those securities in my taxable brokerage account first > have it in cash position > transfer the money to my Roth IRA account > "re-purchase" that same security?  Or is there an easier way to do it where I can essentially just sell the positions?

 

Also, another important queston: since the taxable brokerage and the Roth IRA account are both post-tax accounts, then will the above transaction (either having to sell the security and re-purchase it in my Roth IRA.... OR just having the "position" or ownership of the security moved from my taxable brokerage account to my Roth IRA) trigger taxes that need to be paid? They are both post-tax accounts right?  sorry I'm having issues conceptualizing whether or not either (or both) events above would trigger taxes for the 2025 year

 

Thank you in advance!