Best Strategies for Warming Up Emails with Smartlead.ai

Hello everyone, When it comes down to warm-up the E-Mails for the cold outbound with smartlead.ai, what strategy do you follow to keep the domains and Mails alive and healthy for a long period of time? I am new to it and heard a few strategies on YT etc. so I am courious, what the real GTM Engineers are doing. Thanks for your insight Cheers