Welcome back I enjoyed your old videos. I have taken a few things from your videos and integrated it into my trading, though I do trade differently. I'm not sure what advice has been given to you yet about securing accounts, etc. but I am going to give a few tips that have helped me immensely:
Use a password manager such as LastPass(this is what I use) and let it generate a secure, complex, unique, long password for every website. At least use if for the websites that security is a must.
Use 2 factor authentication wherever possible, particularly on important account related websites.
Your primary email that you use for logging into your financial websites(broker, bank, exchanges) you absolutely must use 2 factor, and have the longest most complex password possible. This is where LastPass shines as it can auto-fill that password for you. If someone gets into your primary email they can reset your password all over the place and have access to everything. It actually is not a bad idea to use a separate email just for your secure accounts.
If you do use LastPass, use a fairly long password and do not lose it as you cannot reset it like other places. Do not allow your browser to save this password and require re-logging periodically.
RE: Trade like a profesional, with no emotions + building small accounts