There are several effective ways to send large files, depending on file size, security needs, and convenience:

• Use file transfer services like Smash, Filemail, WeTransfer, or TransferNow. For example, Smash allows you to send up to 50GB easily by dragging and dropping files and sharing via email or link. Filemail supports sending files of any size with secure links and email notifications. WeTransfer lets you send files up to 2GB on the free plan without an account. TransferNow offers up to 250GB per transfer with no registration required.

• Cloud storage services like Dropbox provide options to share large files or folders via shared links, with configurable permissions, password protection, and expiration for the links. Dropbox Transfer supports sending files up to 100GB or more without occupying your Dropbox storage space.

• For very large files or more technical solutions, FTP or SCP servers can be set up, or peer-to-peer methods like torrenting can be used. Also, compressing and splitting large files into smaller chunks using tools like 7zip before uploading or sharing via a service can help manage transfer limits.

• Email clients like Outlook limit attachment sizes but support sharing large files through integrated cloud storage services to bypass size restrictions.

In summary, the easiest approach for most users is to use online file transfer services (Smash, Filemail, WeTransfer) or cloud storage sharing (Dropbox). For frequent or very large file transfers, setting up an FTP server or using specialized transfer tools is an option. Always consider security features like password protection and expiration when sharing important files.