I'd recommend https://m.kuku.lu/ for e-mails. You can choose your own username, password and also use 2FA and don't need to enter any additional information. I also use it for school mail. Source: about 1 year ago

You can get a .jp address at https://m.kuku.lu/. Source: over 2 years ago

InstAddr for temp email without losing the email account. You choose when to delete it. Source: almost 3 years ago

If you're an Office 365 shop, the To Do app is a life saver (login to your email in the web, click apps on the left side, and then click To Do). There's also https://kanbantool.com/ which has a free tier. Source: over 1 year ago

Write it all down in a planner (hard copy or digital- I prefer paper because my pen-brain connection is stronger). Need to reply to an email? Schedule it for Thursday at 10am. Call a friend? Put it on the books with a time. Trash goes out on Tuesdays? Make a note with a checklist for Monday nights. For big projects with lots of steps, I use a free web-based project management tool (kanbantool.com) and project time... Source: almost 2 years ago

Kanbantool.com — Kanban board-based project management. Free, paid plans with more options. - Source: dev.to / almost 3 years ago

Also ask the developer how they want to work, and if there is a software they like to use to facilitate the work. Are they Kanban? Scrum? Waterfall? Watch a video or two on the do's and don't of the one method the Dev wants to use, so you know what to expect if your developer asks you for a "Story" or a "Task" or a "Ticket" or if you need to 'clarify acceptance criteria', which is literally what I was doing at... Source: about 3 years ago